People suck. Not all of them of course, but so many of them just suck. I have received four bad feedback in the last year. Two were from a guy that chose the 'Local Pickup' option when he was two time zones away. I asked him about it, and he called me liar and to prove he hadn't paid shipping. I refunded his money and I got two negative feedback for my troubles. Another one was a German who bought a movie script from me. Wanted me to lie on the customs form about the value, and then it was later lost in the mail. After contacting the German postal service, and the United States one, it was deemed "lost" and "sorry about that". That cost me $300 when I refunded the money and I got a negative feedback anyways.
My favorite one was when I sold a vintage thirty year old Madame Alexander doll to a woman who later gave it to her three year old gradndaughter. The doll was a flower girl and so was the granddaughter for a wedding. Well, the three year old broke it and started crying and "ruining the wedding" apparently. I got a negative for that.
As of today, I've received 652 feedback in the last year. 648 good, and 4 negative. eBay still treats like a criminal every time I call them about something like that., and I gave them over $3K last year in fees.