> I am in the process of building a rig that pushes 50MH/s
Well, that's equivalent to the whole network hashrate, so yeah it's going to rock. Except it won't!
It is clear that your hashrate estimate is incorrect. Depending on hardware, you can expect to generate around 2H/s/$. So to produce 50 MH/s you would need to spend $ 25 million on your rig...