I'm new to the FPS situation

So after quitting runescape "boooo" but yes I did play it for 3 years. I looked for new games, and I was tired of RPG's so the first game I remembered playing that was a FPS was crossfire, so I stayed with it.
But I'm still not adapted to the FPS situation, how come on forums and such I always hear about people switching games? I don't really get it, why don't people stick with 1 game?Is this how the FPS thing goes? You play for sometime then leave?
I'm just curious

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