If you are the only participant left in an economy you are not the winner...
Just let the market run itself unless we have a situation were team cost is to big to sustain too many transactions like what happened with rentals when golem was nonstop posting... and Doesn't seem sps rentals is causing any issue so... idk, looks like a bad proposal to me, but i may be biased, Since I rent 60% of my sps to get better rewards.