I tend not to treat my pins as an investment, if they increase in value since I brought them well that's just good luck, I brought them for the enjoyment value which is just priceless!!!

Thats a great way to look at a hobby....Ive always done that with my bikes and cars, sometimes Ive been lucky and had a win when selling (If I dont count my time) but most times I'd rather forget how much Ive lost on each but remember the (mostly) fun Ive had with them.