I remember my dad saying, the item is only worth what someone is willing to pay. I stopped selling to dealers (in re baseball cards). My brother will get my stuff and I will beyond caring. re. marbles, I collect what is eye-appealing like some Jabos and Mega Marbles and certain color combination(s). I don't chase on ebay. I rarely buy anything over $15. That being said, after a month and change of collecting, I have marbles that I enjoy looking at in the kitchen when I make my espresso in the morning. They are contained in plastic organizers.