It's all perception. If Pit Bull added on a set of decent strings at cost price, at say AU$35, then a large number of people looking at a similar bass kit that had the standard awful set included, would just see the Pit Bull kit as more expensive.
But maybe it would be possible for them to offer discounted bass string sets when you bought the kit. I don't know what deal they've got with Ernie Ball (as they are supplied with the guitar kits), but if there is an arrangement in place, then maybe it could extend to bass strings as well?
Edit: Just checked the site and Pit Bull do now sell Ernie Ball bass strings, though at a price just slightly higher than the UK price (before UK tax is added), so I don't know if they are any cheaper than you'd normally get them in Australia.
Last edited by Simon Barden; 24-06-2021 at 06:22 PM.