I can understand asking for a lower per sq/ft price, but his ignorance of what it takes to add 150% of area is simply mind boggling.
This is a prime example of how our trades are viewed as a market commodity with market driven prices as opposed to a cost based product. We don't sell widgets and pass along savings because you're upping your order by 150% and we can pass the freight/packing/handling savings on to you.
In fact, on a construction project, this can significantly drive up the per sq/ft price of the finished project by adding in additional expenses with silly things like site preparation, structural support, larger structural supports, access difficulties, material storage and delivery costs, etc.
Its important to educate your clients, but Chris, this guy knows it all. I would just send him an email that says something to the effect of, "Thanks for considering me for this project, however I feel that at this time we have too many fundamental differences and expectations for my company to be able to build out this project for you.
I wish you luck and hope you find someone more suited to your unique project needs.
Regards,
Chris "I ain't working for no tightassed dinks" XXXXX