Purchase or sale mistakes you've made
I'm wondering if other people have done things they regretted, anywhere from right away to years later. These can include mistakes due to ignorance, rip-offs, lack of foresight, financial necessity, not enough research, too much research, impulsiveness. Anything goes.
I'll start with a sale: Several years ago when I wasn't sure whether or not I'd go back to large format, I sold a mint Sinar A1 with a mint Nikkor W 150 for $200. Why? I haven't the foggiest. I didn't need the cash, and as it turns out I went back to large format. This was long before I was a member here and at the time it didn't even occur to me places like APUG existed. I didn't think anyone on eBay or whatever would be interested in view cameras and didn't bother to even check. So, thinking there was zero direct market, I sold it to a local photo gear trader.
File this under ignorance, lack of foresight, impulsiveness and dumbass.