Sell the hard-to-find hardware so someone can actually use it. There are a limited number of them and they're hard to get. As long as it's sitting in closets the Amiga software pool isn't growing, but shrinking, thus the Amiga, for what is the hardware without the software, is shrinking with it.
I'm sure you can run a BBS with lower-spec hardware. I'm almost certain the BBS software isn't PPC-only, while new software need a PPC.