Unlike Inferno, that has 69 waves and takes on average 45min-1hour to complete, The Colosseum takes around 20 minutes to reach Sol Heredit so I don't think having donators start at later waves benefits that much.
Wave skipping on inferno is a time saving perk that pretty much skips 'filler waves' which makes sense on a RSPS. But wave skipping on a 11 waves minigame where each one of them represent a challenge is just lazy in my opinion.
There were already made significant changes to The Colosseum to make it more accessible and people are still figuring out ways of getting it for free...
No Support from me