I would even go higher with that system, like up to a specific SP amount which is necessary to be classified as something else than plankton.
But I don't see any reason for that system to be under abuse. Using multiple accounts to farm that is totally overkill. They need to get those accounts, setting up those upvotes and then posting at least stuff which is "good" enough not to be downvoted while staying under the radar. I don't think that this is possible in a reasonable scale.
On another note: This basically frees up (almost) 50% of those rewards.
How about pushing that flat distribution again? I would love to see that sbi provides a basic income for every participant in sbi. Driving this whole discussion to a good end for everybody (at least for unitholders.)
I'm pretty sure they don't like the standard units, but a basic support level for every account? That can't be bad.
Regular SBI units are effectively account-level curation, and not many have voiced serious objections.