I agree with Frolic. Everything is individual. Most people burn out on things. But some people are happy collecting artwork and owning the same pieces for decades.

But it also depends on what part of the hobby you get involved with. Don't forget, you've got playing casually, tournaments, buying/selling, repair, restore, social events...

Personally I get bored with some pins after owning them for a while, but I love repairs. Always something different. Always a new challenge.