Numerous sites selling services, Facebook Likes, Twitter Followers etc. that were only a couple months old, claiming no work and thousands in sales.
Writing sites that were riddled with grammar errors and claimed X amount in revenue but were charging unlikely fees for articles.
Duplicated sites being sold by others as original design and content.
Premium themes with Script Nulled by XXXX at the bottom. (I imagine this means it was a stolen script).
A site claiming no traffic, no revenue, and no seller "trust" selling for several thousand dollars because of how it was hyped.
Websites that were once cash cows but lost tremendous rankings due to Panda asking for a Pre Panda price and getting it by presenting older data and not what has happened recently.
In one case a poor buyer was back to try to sell a website he had just bought a few days before for several thousand dollars because it was much more technically challenging than the seller had revealed. He even says in his listing, something to the effect of, " I don't understand this". No bids yet.
In this economy with people desperate to make some cash, I guess many people just aren't doing due diligence. And people sure do take advantage!