I have to wonder how you can say that you "love" TSPP if you hardly ever play it.
Dude, seriously. Give your head a shake.
Sell the pin you're no longer playing and get something new.
If you have enough for 2 older titles, you likely have enough for a NIB like Metallica or ACDC -pins that will likely keep your attention.
The stupid thing about this hobby is the "need" to keep these things when you're no longer playing them.
What's the point?