i think the breakeven point is a bit lower than they estimate, because basestealers put more pressure on the defense and pitcher....wild throws over to first, throws into center, having to cover first base, having to play a little closer to the bag, defenders out of position on stolen base attempts, pitcher loss of concentration on the hitter, fatigue from throwing over to first, defense back on their heels as runner and pitcher play games....extra bases gained on a run and hit...etc.