It seems only you have ever heard of kickbacks. Sadly, they are how government is run, and taxes create governments.

SPS sounds like a perfect mechanism to tax from the smallest stakeholders a flow of funds to a group of cronies with enough stake to ram through their proposals. We will see what happens when we allow a group of 35 rapine profiteers that have already managed to extract ~90% of the inflation from the rewards pool to vote themselves another 10% of the rewards.

I think we both know what we'll see.