The idea is good for non-profit recommendation kinda stuff.

But in FOREX market, successful traders wouldn't want to share too much about their systems, not forgetting this site is for free. And if there is a contest, if a trader can make lotsa $ in trading, then unless the contest is more than what he is making, if not I doubt traders would want to contribute their systems.

That is why we have many people here searching for indicators here and looking to develop their own systems and trade for a living if possible.