Problem is, execs would like 300M revenue now, with a buggy PoS, than 500M after 6-12 months. Because those 300M can let them make another crappy game and release it 6 months earlier (12 if both skip on quality). Then you are missing 400M revenue, but you get 600M 12 months earlier. That recoups costs and looks nicer on reports.
Or in other words, gamers hate buggy releases, but not enough to change the practice.