Oh wow, so shit just got real concerning the RMAH: http://us.battle.net/d3/en/forum/topic/5889158971?page=1
Basically, the recent patch just nerfed Increased Attack Speed by 50%; a popular stat as you'd imagine, and it was a very big nerf. This nerf was retroactive, and even affected items that were purchased with real money through the RMAH. Certain buyers of said items have been in touch with their banks, who apparently have no problems classifying it as a bait and switch and are issuing chargebacks.
Though I've not bought anything from the RMAH, I have sold a few items. One of which in particular had a good dollop of IAS on it, and that was easily the selling point of the item (it was a helm, and it's one of the only items in the game that has IAS in that slot; other than that the stats were mostly useless).