A $100,000 lottery ticket would in the US involve 30-45k in taxes for an unmarried person.
So I bet it would probably sell for around $75,000 cash up front, which is a decrease from the sticker price.
But if I was the winner, I would treat it as extremely shady and probably just go the legit route for almost any price.
The US banking system easily detects large cash deposits under 10k even into bank accounts, and then confiscates the money.
And I don't really want to keep $75,000 cash in my mattress.