I have to agree. 5 levels is a bit meager, and training anything past 50 gets horribly expensive.
I get why there is a training limit, it just shouldn't be so few. If you're a higher level, say 30s-40s, and you want to train another skill you don't ever use, chances are those 5 levels of training aren't going to do a lot for you.
Also about the RPing thing, never thought of that. I wish there were more things like Angi's Camp, where she will physically in game
train with you to improve your skill with a bow. I though it was very cool, and there should have been things like that for other skills.