True, attracting users and traffic may not be easy and seems to be the fail point for many ideas, but why not consider scaling issues as well? With products like EC2, ruby on rails etc. its easier to plan for the "techcrunch" scenario than ever, so why build your site in fortran on a computer you bought at goodwill? In other words, once you get past the prototype stage, I think it might be worth it to take the extra 5 minutes to do a little research.