3 and 33.3%.. that's my answer, if 3 people are playing with a total fo 33%, tat means they have at least 11% chances of winning, and in gambling regardless of what kind, more chance of winning attracts gamblers more.
Actually I am quit confuse about the question because in reality, lottery does only give a very low percentage to gamblers, lower than 1%, that's the chances of winning, and that's the reason why they can even accommodate millions of gamblers with sometimes no one wins in a single draw.
We can't say that we are a lottery platform because as you told instead of 3 players we are going to have 3 numbers and a user can select any one number, at the end of the day the number which has got least selections will be the winner and the bets will be distributed proportionally.