People are jerks and post things in singles and if you just click through them it is VERY easy to get absolutely screwed when there's some crap put in at scam prices. Why not put a protection in that if an auction is >200% normal price you have to comfirm the buy? Maybe even make it a setting that you can enable and disable and set the percentage you ant it flagged at? Getting ready for naxx and buying superior defense elixirs and clicking to get the last remaining ones bought and ended up buying 2 for 600g each before I realized my mistake. They were all grouped in a single group that showed 150%. Another option would be to split out anything over a certain percentage into a separate group. I lost a LOT of gold because of the way the addon groups things today!

Please add the popup for over 200% normal price protection!

The default settings color-code the auctions for prices, and things outside the normal price range are colored red.
However, you can be fooled by the lag: if you click and nothing happens (this happens sometimes, when aux - or the AH - is still processing something), then you click again, and suddenly all your clicks are taken into account.
And there you are, the proud owner of a 600g linen cloth.