I really have no idea what the value is. I too would prefer to have a price listed in an ad, but in this case I'm entertaining offers. I would rather trade for something interesting or a few WF Plomb tools I don't have. I figure in the open market it would be worth $20, $25? (Yeah, eBay is nuts over Plomb these days!) Then again, I really don't want to insult anyone buy over pricing it.
Having it sitting on the bench the last few days, it has started to grow on me. I don't know that I would ever use a wrench that big, but it is nice to know that I COULD use is if needed. Maybe I should just carry it in the car for self protection!