One of the problems with the US brands is that you seem to be paying far more in Australia for them than we do in the UK (which is still far more than you'd pay in the US). Just trying to find an example and there's an American Vintage '52 Maple Tele that is selling in a Melbourne shop for $3439, that is £1515 in Andertons, UK which equates to $2443. So that's basically $1000 (or £620) more expensive than in the UK. As shipping is so cheap these days, most of that difference must be in import duties. I certainly wouldn't want to buy one for that price, nor for the extra money that you'd have to pay to get a new Gibson! The recent drop in the value of the £ is hitting US guitar prices, so a few months ago we would have been paying around 10% less.
I do have a selection of Gibsons and Fenders. My most expensive one (purchase price-wise) is a Custom Shop NOS Dave Gilmour Strat, which is a thing of beauty to play (and as my ex-Fender demonstrator mate said - it sounds f***ing gorgeous). That was a 50th birthday present from my wife (yes, I really am that lucky!) and cost £2600 at that time (around $4200 at current exchange rates). It has the most wonderful neck on it; even though it's a 7.25" radius, the action is as low as any of my Gibsons. Whilst it may never recover its purchase price if sold, it will still sell for a reasonable percentage of that. My '98 Jap fotoflame Strat, bought used for about £280 in 2002 and since fitted with Kinmans, sounds very similar, but still doesn't feel as nice or as inspiring to play. Other, older, musician friends who've spent a lot of time in the US (including one who actually knew Dave Gilmour really well in the late '60s and early '70s, was in Joker's Wild and depped for Syd a few times at the start of Pink Floyd) and had bought and sold around 500 guitars in their time, said it was the best Strat they'd ever played. And far better than any other Custom Shop Strat they'd tried. So maybe I just struck lucky with it, but I'd say that guitar was worth what (my wife) paid for it.
All of my other US guitars have been 2nd hand - either from shops or more recently eBay. And certainly at 2nd hand UK prices, I'd say they are worth it. The name does generally help keep the used prices decent (though I'm still after a good bargain). And I don't expect the prices of used good brand guitars to drop much.
I bought an almost new and unmarked all Warmoth parts Tele on eBay for £380. Pricing up the parts, including the case, without any possible assembly costs, I came to £1400 ($612 vs $2260). It's very unlikely that a £1400 Fender would have sold for much less than £1000, even thought the parts would have been better made, with nicer woods on the Warmoth than on the Fender. Had it had 'Fender' on the headstock (actually it did say 'Fender' on the headstock) and had been made by them, I wouldn't have bothered bidding (I do a lot of 'speculative' bidding on the off-chance, and have got myself some great bargains).
So, move away from Australia and the cost of the big-name US guitars drops considerably, making them seem much better value. In my opinion Fender currently seem to have a much more consistent quality level than Gibson have, but then I'd never buy a new guitar I hadn't played, and have walked away from lots from both makes. And I've never got on with PRS guitars. Gibson's management seem to have lost the plot completely these days, though it and their QA, has never been particularly great ever since the '50s IMO.
I know people who visited the Gibson factory in the '80s and the management were openly snorting coke at their desks and in the late '80s and early '90s my ex-guitar shop owning mate often sent all his new delivery of Gibsons back - some hadn't even had the electrics fitted whilst a lot needed their necks reset to be made playable.
My Les Paul (Jimmy Page model) is from 1995 at a time when Gibson were generally making them well (even though it came with nasty ceramic pickups that got swapped out to some Bareknuckle Mules) but I'm not really tempted by much in the current range until you start to get into the custom shop models, and I wouldn't pay those sorts of prices. Needless to say, their 2015 'improvements' were a disaster.
I've got a Vintage Lemon Drop (Peter Green LP style copy) that plays as well as, and sounds very similar to, my Gibson LP, but it's certainly not as well made with some terrible faux-ageing. But for £240 new (a few years ago) it is a superb guitar. But I wouldn't want to get rid of my real Gibson.
There are some good custom guitar makers in the UK, and depending on type and specification you'd be looking at £2000-£5000 ($3200-$8000) for a full custom build, (less for some makers that that use bought-in necks) so a bit more in the UK than a standard US LP or Strat, but you're in PRS territory. On the plus side you get a unique instrument, on the minus side you don't really know exactly how it's going to turn out until it's finished and in your hands, despite how much you've chatted with the maker about it. Despite your choice of exotic tonewoods, it may still sound a bit 'meh' or not feel comfortable in your hands. And very few custom maker's guitars sell used for anything like the original cost, so it's unlikely to be of any investment value.
The only UK custom electric guitar maker I know of who's guitars have gone up in value is the late Tony Zematis, made famous by their use with a lot of UK big-name bands. These days, there aren't as many big UK bands around, and those that generally use standard US or US custom maker instruments.
But there are some very good budget level guitars out there. As has been said by others, starter guitars are so much better than they used to be. There are some cracking Squiers that are almost as good as real Fenders (and with a few upgrades, often better). I've never been a fan of the Epiphone LPs (haven't played that many but all of them felt nothing like a LP). but Tokai do some very good copies. In the UK the Vintage brand do some well made, low-cost copies as well.
And I've concentrated on the US guitars. There are some great Ibanez guitars out there, for not too much money. Their bottom of the range guitars are adequate, if not that inspiring, but spending a bit more, once the hardware and pickups become decent, there are some really good guitars to be had in the £300-£400 region. Yes, their Japanese made models are better made, but they won't necessarily play any better. Their hardware might last a bit longer as well, but you are paying a lot of extra money for that.
I'm rambling now, so shall stop.
(I haven't converted every £ value into $Aus but at the moment it's roughly $1 = £0.62, or £1 = $1.61)