WIthout the cooldown period, I could schedule shops I know I can't complete in time, and then grab them again the minute they expire, and then repeat the process indefinitely until I have time to get around to them. And then maybe toward the end of the period something comes up and I end up not even doing them. Not necessarily a bad system. But then everyone will start doing it, and eventually the MSC will get fed up with having to pay high fees to get dropped jobs done at the last minute. And it will favor shoppers who are good at gaming the system, and discourage newcomers. Good for me, but not necessarily good for the MSC, who want a larger shopper pool to help drive down fees. And I'm sure the Presto sysem, which requires upfront payment to even list the jobs, make things more complicated.