How much 'hobby stuff' have you held onto?

[Null]

 Is there anything in particular you got rid of that haunts you?

Over the years I've been so bad fiscally most things of value I've had have been sold. The worst was my Pokemon cards that If I kept would have legitimately funded a down payment on a house. There was a time where I owned booster packs and cards that are now worth hundreds of thousands, legitimately. 

I'm just so bad with money. It burns a hole in my pocket just because I guess I never had it growing up. So I think that seems to have either one of two effects on people - either you become terrible with cash because you're not used to money management, or you become really frugal and good because you don't want to experience that insecurity again.