Pretty much no one needs to worry about scalability in the beginning. A properly constructed system will typically be more than enough.

And most should defer the pricing question by going free or freemium at the outset. If you end having built something that people like, it's easy to make money.

One of the more useful things I've seen on HN. However it seems to only really apply to B2B. There is a bit of a hand wave about B2C at the end. Would love to see more thoughts about its applicability there.