is sports betting actually profitable long term or just fun money?

I've played a lot of blackjack over the years, always trying to get that edge with basic strategy, card counting and all the little adjustments you can find. I’ve always believed casino games are beatable in the right conditions, but with sports betting it feels murkier. The sportsbooks set their lines real tight these days, and every promo or odds boost feels like it's got a catch buried somewhere. People talk about long-term profits but when you factor in vig, the swings, and all the time spent researching, is it really any different than playing hands of blackjack for comps and maybe the occasional hot streak?

I know some guys say they grind it out for a living, but I can’t figure out if that's legit or just selective memory when they win big. Does anyone here actually keep a log of every bet, or have a method that stands the test of time without needing some crazy inside info? Or is this all just a more exciting version of throwing chips at a roulette wheel?