Sports bettors who can make money on sports betting exist and probably continue to gamble today. And I also believe that they are investing it elsewhere because they think that nothing lasts forever and they have to have a business to keep making money even though they are still betting on sports.
If they invest the money from their winning bets elsewhere, it doesn't mean he doesn't believe in his skills but it shows that he can be wise and know when it's time for him to stop betting. People who can make money from gambling in the long term have more experience and a high degree of skill so they can see things from different angles and decide what is best for them.
out of 10 wins I think there will be some losses and its not sure if the wins are worth the losses because even though betting strictly on every sport does not guarantee always wins.
I know what you mean if a gambler gets a big win from gambling or gets a win every day after that the winnings are invested elsewhere which has a little risk that does not mean he not believe in his skills but he only thinks in the long term and someone does this have a good mindset to manage their finances. so gamblers like this can be said to be professional gamblers.