How often do you and your group change systems? I'd imagine the answer is different for everyone. I know groups that are still out there playing in AD&D Revised campaigns that have been going for nearly twenty years or more at this point. I have a friend who has been running an L5R game for the last 10 years but they switch to the newest edition a little bit after it comes out (usually at generation gaps and such.) On the other hand, I'm personally hard pressed to have a game going for more than a year or two and regularly like to try out various systems.
How about you? How often does your group change systems? Each game? Do you finish one campaign and then swap systems or do you swap a lot in the middle? Even if your games end, do you stick to the same system? Are you an AD&D group? Maybe 3.0/3.5/Pathfinder group? Maybe a different game altogether like Shadowrun, the West End Games' Star Wars system, or something else?
How many folks out there change systems regularly? How many stick to the same one? Has anyone never actually tried more than the one system that they've been playing for months if not years?
Sound off in the comments.