No - buying an expensive domain name is not increasing customer value when so many names are still available - use your money to make your application better. My cofounder demanded a .com name, and I agreed - .com is the way to go as long as you can still find a suitable name. For example, our company makes a project management application with the essential feature that it focuses on customer valuestreams. After brainstorming for hours and bouncing around about 30+ different dot.com permutations (and using a thesaurus extensively as well as the greek-english dictionary) we ended up with the simple name: StreamFocus.com essentializing what our app does. (We just finalized the name last weekend)