I collect. That says it. Anyway, specifics; giraffe statues and pictures, my grandmothers matching china and crystal, Amberina glass from the 30's and 40's, a certain type of Japanese dishes from pre-WWll, a certain style of furniture from the 20's and 30's.
I also collect Anne McCaffrey books and Diana Gabaldon. I have them in hardback. I try to get rid of most of the other books. If it does not fit in my book case, I have to get rid of something. I also collect some little glass animals. My china cabinet is overflowing so I got another one. It is now overflowing. I also have a couple of display cases. My craft collection is restricted to an old trunk. If it doesn't fit in there I can't have it.
Good news, if I really need money, I can sell a few pieces and get a thousand. If you have to collect, make it something that is worth something.