The Problem
So I get the notification that a human being is up for sale in the slave market. So I go to buy their freedom to give them the utopian abundance that is every human's birthright, but of course they have already been bought-- by whom I can't be sure. So I sit there and click where the buy button shows up and get half a dozen pops of various species. I send them all to earth; they can catch a shuttle from there to a planet of appropriate climate. Stellaris has officially become an idle clicker.
SO WHAT DO?
My suggestion is to have the slave market be an auction. A pop must be on there for a minimum of a 30 days. During that month all empires have a chance to bid i