Because on the contrary, the chances of the casino's favorite to win is always 60% possible, which is why a newbie gambler who has absolutely no knowledge about a sport game could predict and win, unlike in certain rare occasions that the opposite might win.
Assuming I agree with you on that win percentage - what if the favorites you're betting on only have average odds of 1.50?
Even if you’re winning 60% of the time, you’d still lose in the long run. A gambler will eventually notice that, since the bankroll will keep shrinking despite having more wins than losses.
Odds matter a lot, because even a high win rate won’t generate profit if the odds are too low.
For example, if you mostly bet on odds of 1.30 or below, that means for every $100 you risk, you only make $30 in profit. So to actually make money, you’d need to hit at least 4 correct bets in a row. The question is, can we really do that consistently? It may sound easy on paper, but it’s a different story when you’re actually placing the bets.