Exactly, "if you build it, they'll come" is the worst advice for startups.
Of course, if you don't build it, nobody will come.
But the real difficult part, and there's plenty of startup literature on the subject, is DISTRIBUTION. That's where the marketing & sales skills comes into play.
As someone that works as a marketing consultant for different eCommerce companies it's the same thing. The product might actually be really good but it's typically going to be crickets without some sort of distribution.
Of course, if you don't build it, nobody will come.
But the real difficult part, and there's plenty of startup literature on the subject, is DISTRIBUTION. That's where the marketing & sales skills comes into play.