Fixed offer
If the seller is asking $10,000, and he has it marked as a 'fixed offer", he is obligated to sell it to you, only if you offer him $10,000.
Any other offer you make him less than that, he can ignore, if he wishes.
Why he would counteroffer with$150,000, who knows... greed?? Ha!! Personally, if I had a domain listed for $10,000, and someone offered anywhere from $5,000 to $10,000, I would probably accept it. What in my brain would make me think to counteroffer with $150,000??? HUH??? Geez... talk about a deal killer!!
There is one other reason possible. That is he realizes his domain is well worth more than $10,000. I am sure I read somewhere that on Sedo you can't list a domain for more than $10,000.... unless... of course... here comes the catcher...... it is appraised by Sedo!!!! Ha! So, this may be the reason he has it listed for only $10,000, but really wants $150,000.
See below for some of Sedo's guidelines:
http://www.sedo.com/faq/index.php?a...ssion=129845#c2ab2c7a08fed02f438063f782d42a19
Frank