how do you come up with a price, for a domain name and you don't even know what the name is?
dunno, uhhhh...
maybe write some varying prices down on 15 different pieces of paper
then put them pieces in a hat, then shake it up, then pull one out and that's The Price!
tah, dah
did they contact you or you solicited them?
how long you had the name?
does it get any traffic, does that traffic convert?
etc, etc..
imo....