Nail polish. I have a lot of nail polish. I had over 150 but culled the lot to less than a hundred but have added some. the issue is that new amazing finishes come out all the time. Magnetic, multi-chrome, holo, flakey, multi-chrome flakey, magnetic holo flakey !!!! I hardly leave the house so no one but me sees my polished nails, which are pretty short, and no one cares, but I love nail polish so much!
(Before you say it, no I will never be able to wear all the polishes I have, but I still love them and regretted it so much when I got rid of some. Btw, if anyone ever comes across the Dance Legend Burgundian Sky from Russia that was discontinued, let me know!)