You would be surprised at how quickly tolerance builds up once someone gets ahold of the good stuff. Considering that this guy is in Berlin, it's probably not as cheap as it is close to the source. Even so, at $300 an eight ball, that's roughly 44 eight balls a day, or roughly 2-4 an hour depending on how hard he's partying. It certainly is on the heavier side of usage profiles I've heard of.