^Yup.
Some people treat WoW, and other games that have an AH type system, as nothing more than an auction house simulator, all they do is buy, quick flip, keep til price goes back up to resale higher later. Maybe even farm when they're bored after checking what is currently going high.
One thing I loved using was the AH on my mobile phone, it was waaaay faster than having to go back to the AH every time. Gather, log, put up AH, log in, repeat. Buy and sell while in the game without ever having to leave any farming area.