how about $100 prize for the top 11-50? if a contestant can be in that position for 5 consecutive month, then he can accumulate $500... i think it can make this competition more attractive...

In fact, the current approach to prizes distribution is already quite liberal. As you may have heard from the "Contest checkup" video, only 37 participants satisfied to the 2 basic rules last month. That means there were only 37 claimants for the 10 prize positions, which gave you about 1 chance out of 4 to strike a prize.

Giving 100$ prizes to 10-50th places is not only ungrounded, basing on the facts above (there is nothing particular in the fact of simply having a positive balance and 10 trades done). It is also pointless because 100 USD is the minimal margin in Dukascopy Live accounts. They bet automatically blocked once decreased to this sum.