No logical reason Scott. Just had it and some PBG original magnetic pickups laying around and thought, what the heck, I might as well put them to use. I really need to keep myself busy and although I could easily spend the time doing some much needed house reno's the only thing that really works for me at present is to throw my energy into guitars.
Based on what you have already told me my thinking has changed somewhat and I might use the Piezo in another guitar. As I said, more research needed.
That DIY pre-amp sounds very tempting and although a complete novice at electrocutions, I would be eager to try this for a future build.
Ta mate
rob