Dunno if this belongs here or in the Sabrmetrics section, but I place it here since it is a question of fact and not methodology.
The question has two parts:
1) Bunting to advance the runner to second: is this, statistically, a cost-effective usage of an out? Just because it is commonly done, doesn’t make it right. I suppose it depends on who you have up there, of course, but taken all-in-all, isn’t it better to go ahead and swing away?
2) Bunting to score the runner from third: what is the actual success rate of this play? Is it so
unlikely to work that it is only an act of desperation? You don’t see it nearly as often as bunting the man over to second.
Note: I’m looking for a statistical answer to these questions, not an unsupported opinion.