People will pay what they feel it is worth to them. And why not?
I stuck my heavily modded B2000 on ebay, with a BIN price of £75. Even with all the goodies (GVP 68030, 12MB RAM, Supra SCSI, GVP/IO, FFV, etc etc etc) I din't expect to get much more than £20 for it.
It sold in less than an hour. To a guy in Australia. Who was willing to pay £140 and wait 6-8 weeks to have it shipped out there.
I've spent a small fortune on my Amiga kit over the last 20 years. Most "recently" a PIV and CSPPC/060. The former is still not fitted, the later fitted last Friday. Now its in, I'm sorta wondering what to do next. Maybe stick the Mig in one of the *two* A4K towers... Then finish rebuilding the A1200T I have.
@Boot_WB - good luck with the auction mate, I'm half tempted to stick mine on and revert back to the Warp Engine 040 in my 4K