You should pay what you want to pay in order to have a useful yet also entertaining piece of camping equipment. These things will NEVER become un-useful, that's for sure.
Go for it! Offer him something less and then negotiate!
I hope you get it, Mark!
In time, we can strive, with practice, to be more like someone like Doug; find something that's been given us as a gift, or something for $5 at a yard sale, etc... and spend however long in it's careful restoration.
Until then, you are able to use your good judgement in spending whatever you feel you can within your means if you'd like to acquire what it is you think you might need to enhance your camp!
Did that make sense? :-)~