I have played on here since 2009. Not saying there aren't some players who cheat but I think you thinking that no one can shoot under 59 in an unlimited tournament is a little off base.
I consider myself a good player, qualified for the Open most every year. Right now I'm sitting on the bubble at 56 with a week to go and only one player needed to burst that bubble so I go back and try again.
I missed an 8 footer for eagle on 18 to miss a 55. Does it take a lot of trying....yes. Does it take a lot of restarts.....yes. Does it take a lot of patience....yes. Most importantly it takes a great deal of course knowledge, especially of the greens. You have to leave the ball in the right place or you have a virtually impossible putt.