Consider: you are an entreprenur/hacker. If you are also your best user, then your best user is an entrepreneur/hacker.
This leads to several undesirable effects. For one, your users will value the product less because they could write it themselves (or they think they could). For another, you're far more likely to end up in a crowded space with many competitors, because the need and the capability to satisfy the need are coincident in the same people. And for another, you may end up with a product that's tailored to the relatively small niche of "hackers", and unfit for wider audiences.
Now contrast with a different scenario: go find some people with a problem and money to throw at it, but no expertise in solving the problem. Learn about their problem. Most likely you will be horrified at what passes for "information technology" in their world. When you present your solution, they will look on it as magic, and you as some technology god.