I resolved that I would not buy lots of additional feet for my new machine. I would only buy feet that I was (reasonably) sure I would use. (Unless I saw one at a bargain price, of course) .
I kept to that. I did buy some additional feet, but the feet I bought have been in frequent use. Mostly.
When making my duvet cover recently, I needed a "stitch in the ditch" foot. I could swear I had one. I looked through the myriad of feet that came with the machine, and the feet I had bought. Couldn't find it. Then I loaded my spreadsheet and realised that I'd had such a foot with a previous machine, I hadn't bought one for this machine.
I did a quick search and saw one on Ebay at a really good price. It was too late for my duvet cover, but it would be rude not to buy it. I bid and, as usual, I had a look at the sellers other items, just in case. She was selling quite a few feet and other sewing bits. I decided to break my rule and bid on several of the feet which I didn't have. I resisted bidding on some of her other items, and I didn't bid on all the feet.
I won some, and I didn't win others. I messaged her to ask about combined postage, and found that she was a really lovely older lady. I realised from her messages that she was me in the future. Lots of feet, unused and still in their packaging. She was obviously downsizing and getting rid of the paraphernalia from a once loved hobby.
It choked me up a bit.