...you can’t afford to ignore the cost of customer acquisition. The earlier you work on this the better, as many of the best techniques require you to build your product differently.
It is also important to ask yourself the question: can my business realistically expect to acquire customers for considerably less than the amount that I can monetize them?
Very nice insight into Customer Acquisition process.
If you don't understand this, do not start your business, until you understand every single word out of here.