I used pre-workout supps for a bit last year. They were fun and I felt energized, but after stopping them, I now feel even more proud of my work knowing what I am doing without them (which is more than I was doing with them). I took BCAAs for a while and didn't really notice anything different, so I dropped them.
For me, a supplement has to do something I can't do without it in order for me to keep it --and the effects have to be noticeable--like creatine or protein. And I have to feel with a great level of certainty, that I am not experiencing the placebo effect to boot.
Complication makes it easy to explain failure.