Thats correct, I earned $5 total. Not 5 bitcoin. I earned 0.00179483 Bitcoin
As we already owned these servers (i.e. servers that ready for someone to buy from us through the hosting company), they did not cost me anything. But on average these servers would cost someone around $150 a month. So doing the math $150 x 3 = $450 - $5 earned, I would have lost $445 a month.
GPU mining increases the output, but from what I read not greatly. You have to use the ASIC devices if you want to generate any real bit coin.