Respectively decline and tell the gentleman you are looking for something older. That would be a good way to get out of it and still maintain his dignity and respect. You never know: maybe he has some cool signs, old bottles or something else you'd like to score on. A local tire station closed up and gave me two like these and I put them on e-bay twice and never sold them. I took them to a swap meet and sold one for $50. The other went to the recycle yard. Those square boxy SS bodied pumps just aren't that collectable. You're going to spend at least $300-$500 doing a good job of restoring a pump regardless of make and on an older pump you are a lot more likely to make that back down the road. One thing those pumps do have going for them is that the price only goes up to $9.99. That's cool. They must go back to the 60's or very early 70's.
