He gets about $9.00 per buy. About 3.5k play, right?
That comes to about $27,000. With taxes (estimating his house is about the size of mine), he's earned about $5,000 (I think, not quite sure about how much everything costs. It could vary between that and $15,000).
So, he has around the amount of money to advertise Blockland using Facechild's video.