Eclipsed Banshee
I loved the Mini Gourmet.... Bought it then promptly regretted it because I couldn't figure out how to use the arm mod the way I wanted to.... I tried to resell it but kept taking it off the MP. Now it's sitting in my Inventory and I'm content because I know it's there when I finally need it. I'm afraid to sell it in case I do want it back because of the inflation.
I regretted selling my Nochi for the longest time.... but I did finally get over it. I bought Case of Pietro last night and although I have yet to use it meaningfully (other than just the gloves because they happen to match) I'm happy to let it sit because it's a good item to have, and I know I'll need it someday for sure.
One thing I can't get past is that I limit myself to buying items I believe won't go down in price significantly, which is usually MCs. But I think I'm actually going to start grabbing a few EIs now because of how many useful poses they have.