This is phenomenal that you could get the cost down so low. My only complaint was going to be the JTAG interface. But, since you've accounted for daisy-chaining 6 of them... that complaint is gone. Hopefully your JTAG signal integrity holds up from daisy-chaining 6 boards. It's touchy.

Give the bitcoin community some time to warm up to your idea. There've been enough scams going around, so it's no surprise they don't jump on the bandwagon right away.

About fpgaminer's open-source code and ztex's "borrowing" of it-- the issue wasn't that ztex borrowed a few bits and pieces. It is open-source after all. I think the issue was lack of acknowledgement.