Instead of a low/high logic, I think the only reasonable way to prevent price-tampering is some kind of meta-modding of user entries.

With that said, any kind of system like this, whether done by Daniel or by STS, is only as good as the entries made. I don't think there would be enough people to consistently do the data entry to make it as effective as it could possibly be.

Once upon a time, I was talking with G in chatbox about CS history possibilities. Since they keep all the historicals, anything is theoretically possible. But there is always the possibility of manipulation of people selling/buying to themselves and/or to friends.

Such market data could be improved simply by automatically filtering out the highest/lowest values for a particular item as well as filtering out results when the buyer and seller are in similar ip ranges. The only way I can see to prevent other market data manipulation scenarios is to automatically filter out transactions between people in the same guild (once available), on each other's friends list, and (in extreme cases) people who were messaging each other shortly before a transaction. The only scenario I can think of which cannot be accounted for are when ppl use another app for communication.

Daniel, I love your idea and the work you've put into it already. But, more than anything else, I hope it gives STS the encouragement to build something like it into PL (and SL!) so that everyone can more easily benefit from it.