Lv 50 dungeons give xp. Totally crap xp not worth running at all, and it never helped the queues there. Don't expect CT to give good xp.
Printable View
Orchestrion record thingies can be collected from the old raids (both Coil and Crystal Tower ones), so they actually did put something valuable/collectable in there, besides XP.
It's just speculation at the moment, and Crystal Tower is much different than the lv 50 dungeons. The reason why the lv 50 dungeons were given XP is to bring it up to the levelling roulette when you entered those dungeons for High Level roulette. Crystal Tower has no roulette attached to it, so the XP from Crystal Tower will have to be made greater in order to make it worthwhile, otherwise it's another case of SE completely dropping the ball when there are plenty of good ideas to incentivise people into Crystal Tower.