I don't have a bankroll at the moment but I think it's not crazy for people who play poker or sports betting to get 10% a month. Winners I mean. Obviously more than 90% are losers.
After writing this I was curious to see what the AI was saying and it said no, for winners half of that, or even less, would be more realistic.
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Sports Betting
Type of Bettor Realistic Monthly ROI on Bankroll Notes
Recreational Negative to 1% Most bettors lose over time.
Semi/Sharp 1%–3% Requires discipline, tracking, line shopping.
Pro/Sharp 2%–5% (on turnover) Sustainable, but you’ll have down months.
Syndicates/ High Volume Pros 1%–2% monthly on bankroll Massive volume, small edge per bet, and excellent market timing.
Don`t believe AI. It isn`t ideal, i catch his mistakes much more often than i want.
I don`t think that i`m Pro, and i can`t calculate correct my percent due to withdrawals, but i mostly made 5+% of monthly bankroll profit. So i think Pro bettors can get 10% profit monthly. Not easily but it is possible.