OK, a bit of an exaggeration. I've seen them tons too. And sometimes, when you get them right before a new release, you will end up hearing a set list that includes tons of new stuff no one has ever heard before. There is rarely any rhyme or reason to the order of songs they play. In some cases, I've heard them rattle off five or six new (unreleased at the time) songs in the middle of a set, or to end a set. The last time I saw them do this was at the Starland Ballroom (6 months ago?). And while most of the songs they play end up on record, I've heard a few that never do.
I'm not complaining. I'm a huge fan. But obviously you are a bigger one. Fifty shows in 15 (or so) years is pretty fanatical.