Also, the majority of people doesn't wanna dump 1500+ USD to an overpriced ASIC, they just wanna try the technology out of curiosity, which is where your board is perfect.
Isn't this an advertisement for GPU approach, not FPGA? At least with GPU, when your interest wanes, you can still play Solitaire.
Actually this is where FPGA's have an advantage. They're not useful for the average user, but for hobbyists and anyone with a lot of data can reprogram it for anything. That's why FPGA's are so versatile and exceed ASIC's. You can reprogram an FPGA to work for SHA256 or even scrypt or for doing dictionary generation.
It would be even more sexy if somehow your PCB's could be modified for the Avalon chips that are now on sale.
Many people do not understand that FPGA's are not the same as ASIC's, even though I know you're just dreaming of the possibility.