I am going to go against the grain here a little bit.
We go through many pins here and while some of them may have had some extra attention needed or tuning (most games do from the factory..) ...these things are built for the long haul.
We just picked up a game off route that had over 1 million flips on the right flipper! The flippers were rebuilt twice as I was told once a year ago and once before we picked it up..
That's pretty incredible if you ask me.