Forex Prediction contest site idea

This is just an idea. I'm a complete nitwit so please don't ask anything regarding statistics. When I graduated I knew how to use statistics. It's has been 11 years now and I forgot EVERYTHING!

My idea: set up some kind of simple site in which people kan add their predictions for price.

For example: Where will price of x pair be at:
- Beginning or end of new trading day
- Beginning or end of new trading session
- Beginning or end of new trading week
- etc.

If loads of people make a prediction we could have a nice database of price data. One could get acces to the database only if he adds his prediction. It only takes a minute and could give a lot of insights. Maybe I can add some sort of ranking and some sort of price for the best predictor. Maybe some trading money or a book or ......

Who would visit such a site on a daily basis? I'll add a poll.

Source.