Like a lottery ticket you only have to buy once (for like $200) for a shot at a little over 3btc as long as it's running.
Uses 19-22w.
Solosatoshi.com
Discussion
I’m more into it as a chance to join the network. 180$ seems like a great entry price. What do you figure it costs you a day to run it, I’m assuming you have it running 24/7? I’m in Canada, we’re looking at 0.12$/Kwh