Ok, then I guess I don't understand your point in your first comment. You seemed to be explaining what approach you would take to invest in collectible in your first comment, by saying you would only buy something that has established value.

I agree that trying to make money from collectibles is not the best way to make money. But then if you aren't buying collectibles for money, your first comment doesn't follow; you should collect things you want to collect yourself, which means it shouldn't matter their ability to hold value.

I'm saying as an investor, collectibles are very difficult and highly speculative, and the friction makes them even less attractive. I disagree that buying old, consistent collectibles cannot themselves be speculative - if you wait for the right moment they can make significant returns. But the downside is significantly reduced if you restrict your investments to something that has been consistently valuable across the longterm.

If you are into something, buy all means buy it. I just mean if you are a dispassionate investor looking for a return it is a pretty poor area to invest in. But if you like something - art, pokemon, whatever - just do what you love