Hold'em poker is specifically good at teaching this viscerally. Nothing lets you feel the mistake of valuing sunk costs than holding onto a once-strong starting hand way too long.
Yes, rather than making decisions due to past waste you need to make decisions that maximize expected value.
What's called "entitlement tilt."
mistake is not in holding strong hand way too long. mistake is in not playing it.
you get called and the flop is shit, what do you do?
going against another strong hand and loosing is one thing - slow rolling strong hand and being outplayed by weaker hand is another (and totally deserved IHMO).