I had a good Collection of Chanel costume jewelry. I sold most of them and for some pieces, I sold for more than what I bought it for (I just had too many and wanted to downsize, trying to get into minimalism lol).
They do make me really happy! Like others have said, you can’t really compare them to fine jewelry. They are in their own category. If there’s something that really catches your eye, you should get it. You’ll probably be kicking yourself later if you don’t. And if you do get it and don’t like it anymore, you’ll make most of your money back. Very good resale value.