Before you ask why doesn't everyone do this, first of all you'd have to figure out how many games it takes to delay the player's clock. And when in the cycles to demote him then bring him back up. Finally, this player looks similar to the one I did it with: a high first round pick who didn't meet expectations. That's really the only reason you'd ever send that kind of player back down after two seasons in the majors, you figure he's a bust but it's still a shame to cut him so you stash him and hope something improves. But you're getting nothing out of him while he's in the minors.