Not necessarily. With startups it's all about growth, and your calculation misses that completely. For example, your number implies they do a "sale" about once

Not necessarily. With startups it's all about growth, and your calculation misses that completely. For example, your number implies they do a "sale" about once a day, however if they've seen good growth, they might have been doing one "sale" a week last year, and 30 "sales"/week today. Remember that in the early stages exponential growth looks worse than even linear growth. (example: http://www.wolframalpha.com/input/?i=y%3D1.5%5E%28x-3%29%2C+y+%3D+x http://www.wolframalpha.com/input/?i=y%3D1.5%5E%28x-3%29%2C+...)