For me, it's all about finding stuff I don't already have.
Fancy electro? Got one, don't need another.
Cocker? Got one I like, don't need another.
Open class pump? Got a nelson I like, got a sheridan I like. Check.
and so on.
But show me something I don't have, well then it's no longer if I want it, no now I "NEED" it.