I have a lot of RPGs that I've played only few times, and many that I've played 100s or more.
D&D, GURPS, Champions, Call of Cthulhu too many times to count.
Top Secret, James Bond, Runequest, Toon, Paranoia, Pendragon, Deadlands: Dozens of times
Ghostbusters, Bureau 13, Fringeworthy...