Is my math (or something else) messed up here?

http://terrahash.com/hosting/ -> $50/month for DX Hosting.

DX w/10 blades = 128W * 10 = 1280W

Based on this electricity usage calculator...

http://www.electricity-usage.com/Electricity-Usage-Calculator.aspx?Device=TerraHash+DX+180+Ghps&Watts=1280&CostPerKWH=.05813&HoursPerDay=24

... it looks like unless I can get electricity for less than $0.05813/KWh, it is cheaper to have TerraHash host the hardware?