It requires a lot of research, time, money and patience. There will always be stories about someone turningR$5 intoR$100K off a parlay, which might increase your appetite to bet with the hopes of striking big. Although possible, it's very unlikely and incredibly rare. Most sports bettors lose money, and often.
Pro bettors make their money on bets that sportsbooks offer that give them even the slightest betting advantage. The key to becoming a profitable sports bettor is being able to find advantages, opportunities where the line a book is offering is vulnerable. This is why many long-term sports bettors are math freaks.