Rather than attempt to save a dollar here and a nickel there, Apple is famous for preferring quality (and good design) over quantity.
You’ll find a great example in Apple Insider’s post about the costs associated with the building of Apple’s new flagship store in Boston.
I have a little theory that a company’s physical space is a reflection of that company’s products or services. The Apple stores are more than a reflection of Steve Jobs’ architectural taste; they are an integral part of the Apple brand and what they sell.