I can empathize and relate. I had awesome tickets to see the 'farewell' / final tour of my all-time favorite band (Genesis) that I bought last Spring, when it was looking like we might be able to get this God forsaken virus behind us by the fall. Concert was end of November, and the tickets cost me ~$500. Wasn't comfortable going by the time October rolled around, as I knew even if proof of vax was "required" that it would be very unlikely to be enforced. (Turns out I was right, based on social media reports I read after the show). Tried to sell the tickets for about a month prior to the event, and got zero takers - even though I priced them well below what I bought them for.
Seems a lot of people are not comfortable sitting among thousands of others at the moment, regardless of whether we're told proof of vax is required. Hopefully most know by now that even the vaccinated can pass COVID to others, and even if you're vaccinated yourself, you can still get it. It seems the only thing most people agree on is being vaccinated does "seem" to lower your risk of having a severe case..but aside from that, even if the event had checked every single person's proof of vax, not sure that would have done that much overall..
I was super bummed out to miss this. The band members are all north of 70, and this was the "final, final, we REALLY mean it this time" show. To miss the last tour ever was heartbreaking for a lifelong fan who followed the band for 45+ years. Not to mention the much smaller problem of losing out on $500...