Re: High Efficiency FPGA & ASIC Bitcoin Mining Devices https://BTCFPGA.com
Power costs is only a concern for miners using old technology. ASIC miners only have to worry about price per Ghash/s, because power costs will be negligible compared to their initial investment.
Power cost does matter, but it's negligible for single device, or small-scale mining. Scale the issue up, and you will be forced to consider those costs more seriously.