For me personally, I dislike the soulless nature of CF shafts, and LD shafts offend my notions of fairness.
My preference for old-school equipment is mainly aesthetic. I could use a CF shaft, if I was only worried about improving my game, but I think they're ugly. I own a really good LD shaft, but I feel that it gives me an unfair advantage against those who don't want to spend a lot of money on a pool cue, and I still prefer the aesthetics and game-play of old-school shafts - they're harder to play with, but I think they're also much cooler.
As a newer player, I have to choose what to play with, because if I switch between LD and non-LD, that requires quite a bit of adjustment. I wish that such a choice was rendered unnecessary by equipment restrictions in competition, but you can't always get what you waaaant, unless you try real hard, and then you might get what you need.