your all kidding your self if you dont think your doing more then treading water after a good number of years training..... unless your realy pushing the envolope with drugs and excess food, you are maintaining after you hit your own personal wall...
my example of this would be with arm size..... i have an 18" arm off gear, 19" on... now that hasnt changed in the last 8 yr, maybe if i abused steroids more id squeeze a little more size out of it..
now everyone i know, who trained 10 plus years will agree that once they got there initial size it doesnt realy change much, maybe you will get leaner and more cut, or you may get fatter and it may increase in size due to fat ( the majority will think this is legit gain! )
i know all the hardcore getbiggers use more weight each workout, and gain 5lb of lean muscle everymonth, but seriously.........