Nobody is saying that, either. If it takes 5 hours in line to ride Space Mountain, then it should take everyone 5 hours. If you don't want to wait for that ride, go to universal and ride the Hulk instead. But allowing people to pay for priority means that in 10 years, only the wealthy can look back on their great experiences on Space Mountain. The poor could never wait long enough. It's intrinsically not fair.
Wait, sorry to derail the thread, but is that really how fast pass tickets work in the US? My only experience with them is at Tokyo Disney Sea, where they are free. Fast passes are given out in limited numbers for specific time slots. So at the start of the day, you go to each ride and get a pass which tells you between which times you can get fast entry to the ride. The only thing you need to do in order to get fast passes is get up early enough (because for the really popular rides, they will run out fairly quickly). You don't need to pay for them.