There is a discrepancy between joestextile.com which will get it's first 500 regular customers in 3 years and a unity plugin that needs to scale to 10 MB/s when it gets it's first 100 regular customers in a week. Both kinds of projects are pretty common. The first one can be done in a week with RoR and a run on a 10$/mo hosting solution for years, the other requires pretty much all of the above.