I don't play slots often, but I've experienced x1000 multipliers. The bets are small, so the returns aren't significant. Even more likely, you'll win a multiplier of x100-300.
In sports betting, turning $0.2 into $10,000 is certainly difficult. Sports bettors might consider small but consistent profits even if they bet larger amounts.
Don't focus too much on achieving a large multiplier. You might neglect the small multipliers you've already achieved and chase your own, more difficult-to-achieve goals.