To be honest i don't think lotteries are very popular and you will hard get few participants(I could be wrong too).
Besides, some gambling sites have lotteries, you can easily find ev+ lottery and it is much easier to buy tickets at one of the gambling sites.
But if you want to run blockchain lottery, sure, why not? Go for it, I wish you good luck.
So far I have been trying to get as many winners out of a game as possible. Do you care? Would you like bigger winnings if the odds were longer? If there were 10 players and the pot was split 50%, 20%, 20%, 9% and house 1%.
20%,20%,20%,20%,19% and house 1%.
What sort of ratios would appeal to you?
If 10 players join, there should be 1(or 2) reward. It is lottery.
More players - higher pot - more rewards.