Stumblewyk
Adventurer
You could very well be right, but I think it comes down to game style more than anything. I reward XP, 100% as detailed in the 4e PHB, but my game is very casual. We play once a month, and it's as much a social gathering as it is a game night. XP just isn't the motivating factor to show up and play.It's hard to tell exactly how much this is influencing their decisions. Maybe your players really don't care. Maybe they stay in character most of the time but jump on situations that seem like they would give a good experience reward. Maybe their every action is silently judged against getting the biggest experience reward possible.
But I play in a weekly game that is anything but casual, and I still don't see this mentality at the table. A challenge is presented, and we overcome it or not. If it earns us enough XP to level, fantastic. If not, we'll get it next time (we hope).
I should point out, I'm not stirring the hornets nest to imply that anyone's doing anything wrong as DM or that anyone's game is lacking in any way. I'm really am just curious as to what type of game/player attracts this kind of metagame approach. =/