Quote Originally Posted by kernal42 View Post
This.

Also, if there weren't an AH tax, then there's nothing from preventing you from bidding up prices on your own (or, rather, an alt's) item, because there's no longer a penalty for accidentally winning the auction.

Cheers,
Kernal
You can't bid on your own auction, nor an alt's auction. (You can get guildies to bid on them, however, just as you can now).