Is a offer of -20 percent on an OBO ad insulting?

If his ad included OBO then you should be able to offer any reasonble amount. Otherwise, he shouldn't have listed the ad that way. Anyway, he sounds like your typical audio snob, probably a salesman in a high-end audio store.

Besides, Krell is way over priced for what is essentially a big power supply.

Jim

Ditto Herman and Bundus.

If he is so uptight/disgruntled, let him rot in.........

I think it's the way you make the offer. How it's worded. Be polite, and maybe even acknowledge that while some might consider it a lowball offer, you don't mean to offend. Personally, I'm not insulted until about the 40% mark, but even then I'll thank them for their offer and politely say no. Bill and Ted are right--be excellent to one another.

Peace, Love, Dope
Dan

People here seem to have trouble with supply and demand setting the price. I love the guy who posted that "OBO" can mean more than the figure actually asked. "OBO" to my mind means the person has made a firm decision to sell on short notice and is willing to accept what is offered. If you can't stand the heat in the market place, get out of there. A polite "no" is all that is required when you think the offer is too low. Such audiophiles on top of being audio snobs in all likelihood are prima donnas. Let them keep their equipment. I suggest they become collectors. BTW I like the Canadians who want to sell in the US telling other Canadians wanting to know how much they want for it in Canadian funds that the item is sold and then who keep on advertising the item for two months on various sites. Jerks come in many shapes, sizes, nationalities etc but share one point in common.