[treis]

>If you create a product that people are searching for and genuinely want/need, it practically sells itself

My adage is this but more generic:

It's way easier to sell someone something they want than to convenience them to buy what you're selling.

This applies to anything. The way to advance at work is to give your boss exactly what they want. The path to a happy relationship is to find someone looking for the traits you have (and vice versa). Sell winter coats in NY and not Fla. Buy the house that meets your needs. And so on.