So 2.50 a day profit or so, almost no power draw for $500 bucks.. at a ROI of more than 6 months, I would pass. At least I can reuse and sell gpus easily. A fpga that can lose its value quick due to competition would be a poor choice. Someone will use a cheaper board and make a faster one. I know a few programmers here that have made fpga miners. They could potentially make a better version pretty easily. Maybe if price was lower I would go for it..