hmm i agree with ceric and the potential problems of electric corruption the base as a power supply could cause. but here's a random thought: what if the base as a power supply is for portability, but not for mobile gaming! a big thing (well sort of but not really) is people using screen projectors instead of actual t.v's. imagine it's night time, you have three of your friends over, and (if ur over 21) you're being drunk and rowdy, and maybe ur baby is sleeping, or your parents, siblings, roomate, whomever, in general someone might be being disturbed. u grab ur rev, four motes, go outside and the built in projector is making the side of your house into a giant 10 ft. screen. now you can play raquetball and wake the neighbors instead! otherwise i don't see the point in making the stand a power supply unless it's just for back up power so if you live where i do and the electric company like to test the system with a rolling blackout when you're three hours into Zelda and havent saved because it didn't occur to you from all the fun you were having. It would save you breaking a wavebird, I mean revmote in your anger.
I added a comma for clarity.