That is partly my problem, though with regards to Rev's comment you'd have to be pretty silly to legitimately suggest they offer zero benefit whatsoever even to someone who has no problems with sleep/recovery/diet. 99% of PWO users use them to mask a problem, but to suggest they're nothing more than a placebo even for those who don't have an underlying problem is nothing short of ignorant denial.
I actually get the most benefit from them in the form of mental focus - by this I mean some days even if I'm not lacking energy, I'm still extremely disinterested in anything but going home and mentally unwinding (dealing with idiots all day is terribly draining when you're forced to humour their stupidity). Some PWO blends give me a bit of a kick in the brain, helping with focus and determination rather than constant apathy haha.
It's not the physical buzz I find most beneficial, but just the sudden "OK f**k it, I'm not skipping ANYTHING this arvo" thought process they can arouse.