Sports betting sharp vs square: what's the actual difference in profitability

always see people talk about sharps and squares like it's black and white but honestly i don’t get where the line is on actual profit. like you hear about sharps crushing long term but those edges are razor thin and bookies are smarter than most people let on. sometimes a so-called square can stumble into a good streak just riding public momentum, especially with promos. i’m big into keeping data on blackjack and honestly most “sharps” i’ve met in real life are just a little better with the spreadsheet than the rest of us. maybe they're grinding tiny arbs, maybe they're just more patient?

also, all this talk about sharp line movement and closing line value - does that automatically translate into reliable cash flow, or is it just another stat like a hitter’s on-base percentage? wondering if there’s actually a clear money gap or if it’s mostly theory people like to flex on forums. curious how everyone else tracks their “sharpness” in actual wins and losses?