my personal opinion... I don't want to play another version that's attempting to be as close to Runescape as possible or I would play osrs or start a new account. I want something I know but with a new experience.
People have gotten into the mindset that all players want to restart Runescape and play the same old boring shit on an rsps.
I pretty much maxxed my account on rs3 (pre EOC) and have maxxed my osrs account and have been playing rsps's since almost the beginning and I feel like RSPS have just gotten boring nowadays
Granted I have never seen a custom server that has gone to great effort to make it look good but I would much rather play them than an osrs server