Isn't that like stop eating/training properly once you start gear?
Why stop the things that have worked for you naturally? Creatine, BCAAs, Pre workout supps, Glutamine, all very useful as well as health supps! Why not give your body everything
Gains from $100 worth of Tren > Gains from $100 worth of Cell Tech
But really, one example why buy leucine (main benefit being protein synthesis) when gear is already doing that for you at a MUCH higher rate.