I like this idea. There's at least one system I know of in competition with your business model. In trading desks, the data of traders is analyzed ato reveal the better traders. Almost always it's because they have some kind of 'inside' information. Can be a small thing like a friend that works somewhere keeps giving them tidbits. Legal or not, this is reality. The finance companies take this internal trading data and build models based around those traders, and sell the trade advantage to their own customers.

I think your site needs to compete with that, and other existing systems for adding value to 'better traders'.