WoW's AH online app - benefits for the rest of us?

Since it's a web-service based online app, it would be interesting to know if there are any major limits on simply querys of the auction house.

I know there are limits on how many auctions you can post, but are there limits on how many queries you can make?

If there isn't, and if Blizzard don't get touchy at other websites using the web-services API (like they currently don't frown at Armoury scanning websites), then this would mean someone else could set up a website which does frequent and complete periodic scans of all AHs on all servers, and make that information available to anyone, even if they don't have the AH app at all.

Sure would save me logging in at all hours of the night just to run an AH scan.

I'm referring to sites like WOWecon.com here.