I've only gotten two offers before.  Both were 
perfectly good.  I only accepted one because I 
was a bit too attached to the cel that the other 
wanted, but if I had wanted to sell it, that 
would have been a good price.

And, yeah, I don't consider low offers an 
insult.  If I had any, I might be a little 
embarrased to tell them that their offer was way 
too low.