Spud, you have no leakers or you dont know yet?
Whereas some guys have problem with them breaking at least you know about it at time of tapping. Unless you inspect every tap you put in a tree before hand you dont notice the ones with ahole in he plastic til you turn vaccum on and trudge through the woods listening. Much different problem. I have a very small number of taps, I cant imagine trying to find defective spouts amongts tens of thousands of trees.