Salesmanship
I repeatedly see entrepreneurs making the exact same mistake I have made myself.
We rush out to hire a VP of sales, and assemble a sales team, way before we have determined that the product we are building actually fits what the market wants.
You might not have many sales without having an all-star sales person on your team.
But it could be worse, you might not have many sales and be paying cold hard cash (and equity) to have an all-star sales person your team trying to sell a product that is still in flux.