10 feels like an optimal amount for me.
The upvotes are now using factors of ten.
1 to 9, = 1 upvotes, 10 to 99 = 2 upvotes, 100 to 999 = 3 upvotes, 1,000 to 9,999 = 4 upvotes
So tipping to effect a rise in a post's rank is (without "wasting" sats) optimally 1, 10, 100, 1,000, etc.
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