I wasn’t close enough to him to reconcile his receipts, but this was a place were people talked a lot, the number was 400k per month, they sent him to rehab because they were afraid how his family might react if they dismissed him, he had to hold a job in order to continue to receive funds from his family.

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.