I actually answer this. He takes it for coin, he doesn't need "exp" because he has all the skills. He doesn't have to get perks or skills to unlock other skills. So the concept doesn't translate well from books to game I've never read the books, but is there ever a time when he's done with a take and he all the sudden says "yes! I can now whirl!"? I highly doubt it. So the exp argument not only doesn't work, but with your argument I should start the game with every skill he can doin the books? Clearly that wouldn't make for. Good game, the reason it won't? Because people want to advance. They want to feel like they are progressing. That's why your "exp isn't the reason to quest"theory is just wrong IMO.
But I'm not suggesting that. I'm just saying that a player should play a quest for the quest itself, but I'm not saying that the level up gameplay gimmick should be cut from the game.