I tried one in a local guitar shop when I was about 17, and wanted one ever since. I'm sure there was a perfect time to get one when the prices bottomed out, but I totally forgot about them until seeing the guy from Summoning The Lich palying one.
Yeah, that was basically like 2008 - 2019 or so. I paid under $1k for most of mine on eBay during that time period (sometimes *well* under).
Interestingly, the guy from Akercocke played one for the longest time but when they started touring again a few years ago he was playing ESPs.
I'd be hesitent to take a Fly on tour. They're more rugged than they look, but like OP mentioned, literally every part (except some screws) other than the tuners is custom. If something breaks (eg, the trem spring), you're not likely to be able to just pop into a local guitar shop and get a replacement. I'd rock a NiteFly on tour though.