In reply to Jon Stewart:
> When I fail on trad, it's normally because I just can't do the moves (for a whole load of reasons, many psychological factors contributing).
> Worth bothering as a trad climber?
I would say yes, definitely. Just because you feel the reason you stop on trad is (predominantly?) psychological, it could be that subconsciously, you know your body isn't up to the task of completing a hard section coming up, so you mentally don't commit. That could well be PE based. If you knew or felt you still had something spare in the tank, you'd be more likely to press on.
Let's face, it upping your PE will do you know harm, nomatter what type of climbing you're doing.