Not all checked luggage reaches their destination, which should be reason enough not to put anything valuable in your luggage, but the reality that it takes two seconds to break into a zipper, regardless of the “lock” you get, probably the seals that decision. Now couple it with the fact that two TSA agents were busted at JFK for stealing over $160,000 in cash from bags and you have three compelling reasons never to check anything important or valuable in your luggage. The interesting part is that the thieves never “broke” into the bags using a ballpoint pen or anything like that, they were baggage screeners. They would take the bags into a private screening room and just swipe the cash.
There are always bad apples.