Well, tickets can just be 1m, and rich people can buy more than one.
Anyways, if the jackpot is 100m, and someone won, 50m would go to them, 50m to Sythe. But maybe give the user the option to get 50m, or a donation rank equivalent to the amount of money.
I'd be willing to keep half of all the jackpot, sell it on Sythe, and send the money to Matthew (or whoever is in charge of this stuff). I'd also love to host it. I am willing to give my personal information to the administration team so that they know I won't just run with it. I'd send pictures of birth certificate, drivers license, medicare card, tricare card, military ID, give them my phone numbers, my address. Whatever to ensure that this can go smooth.