Oh brother....Go ahead and train your 10 times a day. 
Edit: what pro's do you know personally. The only time you need to train more than less is close to contest time. Other than that, its all about putting on size. If you can Deadlifts 455 and then turn around and squat 455 the next day more power to ya.
I know quite a few personally.
Most of them don't know anything about training or nutrition, and that's the best way to go about it.
At some point, someone hoping to push their own image helps them out, and tells them the basics. They learn a simple training routine, and learn to eat chicken and rice.
So, years later, they're busting ass on that simple training routine (not knowing why in the hell they're even doing it that way), and eating chicken and rice.
All the while, pussies like you are learning about some super post owrkout shake, and avoiding overtraining at all costs. HAHAHAH
Why do you think Ronnie does the same training routine he has been doing for 20 years?
Because he doesn't know what the fuck to do on his own. Someone told him that routine, so he did it, and continues to do it to this day.
Do you think he knows why he has a protein drink and grits for breakfast? He doesn't know....he knows someone told him to eat it.
Keep doing your 3 workouts every 7 days, you've certainly done a lot with it hte past 13 years....