I'll buy a pin knowing it won't be a long term keeper, like my 4th Terminator 2 I recently bought. A T2 was for sale local and I felt like revisiting it again after 2 years. I bought a TSPP because one was local and I knew I'd only hold on to it until the upcoming York show. But I never played more than a few games on one, so I wanted to own it for a bit to see what I thought of it. Sold it for exactly what I bought it for and got a few hundred games on it.
But short term to me is a few months.