You could even write that more starkly: worry about supporting your customers because customer support is the only thing that you can't scale easily, everything else will eventually work out. Are there lists of start-ups that failed because of scaling issues? Are there comparable lists of start-ups that failed because of marketing, sales, product, vision, support and a 100 other pitfalls that a start-up can easily fall in to?

I could not name a single company that folded because they could not handle the luxury problem of scaling. Because really, when scaling is your problem, you have no problem, you've figured out a way to beat the odds on all that other stuff so scaling will be solved as well, one way or another.