I've interviewed a lot of pros. They all agree that after a gram, the results are nominal. They do 2-3 grams because even if it gives them an ounce more, they can't take the chance of the other guy's doing it. But those guys would look a thousand times better than anyone here if they took 250 mgs a week and we all took 2 grams.
I also believe sides get far more severe once you go over a gram. Using more than that just to get jacked for a couple of weeks seems crazy to me. But that's me.