I am sure the streamers will win on every single raffle because of million-dollar wagers every day, they get unlimited reloads on btc,eth,ltc balances. If you watch publicly well-known Twitch streamers, they get $30000 on each currency when they bust it all, imagine getting thousands of tickets and not winning a raffle while your competitors have an average $1000 deposit ratio.
Just because you have a lot of tickets don’t mean that you will end up winning. Streamers do have the "biggest" chance but that doesn't mean that you will end up with winning just because you have the better chance because in lottery you end up winning with just one ticket and that means everyone has the chance.
Streamers also lose a ton of money while gambling as well, I recently saw a guy who had a stream and lost 12k euro in one sitting, it took like 6 hours of stream to lose it all but dude actually did lose that much, which was all he deposited (this is another casino then roobet, in fact it was a fiat place) and I am 100% sure that he didn't made any profit that day, even with all streaming income, subscribers, donations, sponsors and all that he still doesn't make 12k euro per stream that is impossible because he was viewed like 2k viewers.
So I think they do deserve to have "bigger chance", it is not like they will surely win, you give people who lose insane amounts of money in your casino just a bigger chance than people who spend a lot less, that is fair.