Ok, if it's on a weekly basis then you won't get an extra 10-20 people each. As matter of fact you'll probably lose that much. (if the entrance price is 10k+) This is because people will realise that they have a small chance of winning due to the extensive number range.Im expecting 30 to 50 players the first time and then an addition of 10-20 players each time after that. And I'm also begining to think a two week roll or once a month roll would be better than a weekly rollIt is way too confusing. I think you are expecting more people than what will actually happen on a weekly basis. You could try to just do 1-100 and roll the dice normally.
Also, I don't believe this was addressed, can two people pick the same number?
My vote, once a fortnight. 5-10k entrance fee. Numbers 1-100.
Maybe what you could try is 5-10 each fortnight then once every 2 months hold a big lottery with 20k+ entrance.
Basically with the current population I highly doubt you'll get more than 30 people at a time.
Good idea though, just needs some adjustment.
Goodluck infinity.