Rainbow Basilisk dead? Yes, we're that awesome.

[Gramul]

You don't even know what all is going to be in this dungeon. It is possible there will be no exp gain, or a small amount.
Also, the dungeons may have a cooldown of a few hours to a day, making them impractical to gain exp with.

I'll still have more fun playing the game than I do now. Leveling isn't a high priority for me when the game lacks a distinct feeling of progression in gameplay, so I don't see much point in getting to 50 as fast as I can.