There's an interesting promotion by Roobet "Roo's $100,000 Office Marsupial F.C." the prize is $100,000 and it will split to 50 lucky gamblers [1]. To join it we need to wager at least $10 to get 1 ticket, but if you bet in any football match with the same amount you will get 5 ticket. This mean it's more profitable to bet on football matches than the other sports or games if you're looking to win this contest.
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https://promotions.roobet.com/promotions/roos-100-000-office-marsupial-f-cRoubet regularly holds promotions like this, it's just that they make quite a lot of changes, for example in the number of players who will get prizes because in the past the total prizes were only for 10 lucky players but now it has become 50 so that more players have the chance to win.
Promotions like this are perfect for high rollers because the more often they play for large amounts of money, the more lottery tickets they can get to increase their chances of winning the lottery.
Considering the many high rollers there, it's natural that Roobet continues to provide attractive promotions so that the players don't leave them, online casino competition is very tight at the moment.