I was once selling a nice silver sparkle Gretsch Round Badge set in 20/12/14 for some kids who found them the trash. Really. Someone threw it out for the garbage man. They rescued it and asked me to sell it for them. I was able to get $2000 for it.
But, the lowball offers were insulting, particularly from the guitarist Popa Chubby. He called me and said his name was Ted Horowitz. I knew who he was. He offered me $400. I laughed in the phone and told him to call me back when he came to his senses, and hung up. He never called back. I got the $2 grand and made a nice commission for selling the set.