[kia345]

If prize costs are going double like that, then that clearly means there will be more events to win. That still doesn't close the gap between "1 ticket - 10000 tickets" very quickly.

So to speed up the process of gaining tickets, while still making it challenge, winning tickets consecutively doubles as well. Not necessarily "win the first event, get one ticket, win the second, get two", but make the amount double for, say, every 3-5 events you win in a row. The ticket "multiplier" ends after you lose/fail to win/participate in an event.