What are your worst eBay listing regrets that you ever had when you tried getting a fixture or bulb that you want?

No regrets, just terrible, terrible luck lately.
2020 has been the worst year for smashed packages from eBay.
I have had all kinds of rare, irreplaceable items completely smashed by shippers this year.
I guess that means I regret that the shippers are terrible in 2020!

As of recently? Probably that time I missed out on getting a medium pressure 400w mercury lamp for a reasonable price. The stuff I did buy arrived more or less intact though.

I also collect vinyl and I bought a record back in March that got lost in the mail. The seller gave me a full refund but I also kinda still wanted the record which was a less common record.