Everyone seems to be forgetting that they host the equipment for no extra costs. This saves a lot of $$$ on HVAC, power costs, and time spent. HVAC/power costs would cost a small fortune for a farm in the range of 5-10Th (especially if these are built on Avalon's power hungry chip design.)

Is 8% APY really that bad? I think it's quite nice considering they do all the work for you.