In terms of total mg per week, I think most guys are around the 2g mark, plus or minus a few hundred mg. That's where I'm at for a blast usually, although I'd like to bring that down as I get deeper into my career.
I'm talking about open pros here. 212 is different, they've got less muscle obviously and will generally need less drugs.
I've never actually met anyone IRL who took 3+ grams of shit. I'm sure it happens but I can't see that working very well tbh... at a certain point more gear can't really do anything: there's nothing to bind to, and it just metabolized or leads to shitty sides.