Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
Mine Is Always On

Because it connects to my home network, and also to the studio wifi. I have alway's used it this way (same for my ipad1) and can't say that it drains the battery much at all.

I only put it into Airplane mode when charging it.
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.