Hard to describe what / why / how - it's a personal aesthetic thing. I collected these as a kid, which is clearly the basis of all this. It's not an obsession, or a collecting thing - it's all very vague and half-hearted and has been going on for years. If I really wanted them, I could almost certainly just get the ones I wanted on-line in one go. It's more like the idea that some of these - and not even necesarily the childhood ones - tick a certain aesthetic box for me. The colour pallette, the design, the era. I like stumbling on them.
This one, my wife bought for me for a quid, because she knows me better than I know myself. She was bang on.