As long as you don't implement some kind of drawdown or lot size rule the contest will not be faire.......... I think I'm not the only one who thinks like this.
For the sake of fair play.
Demo contests are NOT about fairness.
They are for advertisemnet purpose only !
A broker wants people to use their plattform, no more.
What you wish would be a Live Contest trading real money my the participants.
You can see in the history there were already two Live contests, but much less participants, of course.
Even there the result was questionable when TWO particpants created an account at myFXbook two weeks into the contest, and then traded for 3 days with ZERO drawdown to make +800% and win that contest.
VERY FISHY ! People suspected manipulation by the broker, who denied, of course.
You see, even in a real contest the fairness may be nonexistent.
Complexity is expensive, inefficient, and ineffective > Crocodile trading