Ok, so you see me promoting the idea of using the least amount you can, to evoke a strong effect. So if you are new to gear, a cycle of 500mg test e along with adex and PCT is plenty to grow some good muscle, and lots of it. Over time though, you'll find that you get bigger and require more gear. You'll get used to the doses you have used and want to take it higher. Over time, the cycles will build. So yes, after a guy has worked his ass off in the gym for 10-15 years, and eaten more and more protein, carbs and fats to keep up with his added size, the doses often go up to. There are guys that don't understand this and think that if he just runs 2g of test, he will look like a pro. Its not like that. You can only gain so much, so fast, and over time, as you get closer to your genetic potential, gains get smaller. So yea, you might gain 25 lbs on the scale in your first cycle, using 500mg test, but the guys who are using 2g...they might be making gains of 5 lbs in a year! There are guys out there that are using 2g of test. There are guys that are using more. Seems like the guys using the most gear, are the guys at the amateur level, trying to push poor genetics to become pro. There are also some pros that use very light cycles. I can tell you personally, that especially some of the 212 guys are using low doses. If you look at Chris Acito's guys, you'll find a lot of sensible users. You'll find guys that stay on low doses in the off season, like 250mg EW test only, along with gh and cycles of insulin. Then hit it harder in contest prep. But if they keep the doses lower for 20 wks, "higher" doses for prep don't have to be super high to get a strong effect. Here is an example cycle of a 212 pro that walks around at 230 in the off season with shredded glutes at 5'6

750mg Test EW

50mg Drol for the first 3 wks of the diet

300mg EQ EW

Tren and mast at 100mg or less each in the last 8 wks

Maybe 20mg halo for last 2 wks 

GH through the year at 3iu

There are guys smaller than him using 4g of test and guys bigger than him using similar doses to what he does