In my opinion I think instant approval should stay like it is; it's given to people who have proven to consistently upload quality resources and know what they're doing.
I do think that the system could be abused, a donation might not hinder some people who want to go on a huge spamming spree (which would be even worse if this includes revisions). It would also widen the gap between supporters and non-supporters, as this is quite a significant perk (whereas the removal of ads and the other current perks aren't really huge things), which is something we want to avoid. Something like this should be earned, not bought.
I do think that the system could be abused, a donation might not hinder some people who want to go on a huge spamming spree (which would be even worse if this includes revisions). It would also widen the gap between supporters and non-supporters, as this is quite a significant perk (whereas the removal of ads and the other current perks aren't really huge things), which is something we want to avoid. Something like this should be earned, not bought.