What are you going to do to scale when the time comes? Are you planning for it now? Does it involve Amazon EC2, S3, flexible payment or another Amazon service?
Services like Amazon’s Web Services are going to be critical for startups who need to grow. It is just too expensive to manage all of your own hardware and if you are the flavor of the day, or if your customers have short bursts of demand, you are going to need to scale up as quickly as you will then need to scale back down. Every startup should at least asses the savings they might get from using on-demand storage and computing.
Check out bootstrapping with AWS to avoid VC over on slideshare.