Plus, if you're building something that is actually solving a problem for people that you know you might find that you get it right in fewer iterations than if

Plus, if you're building something that is actually solving a problem for people that you know you might find that you get it right in fewer iterations than if you're only getting feedback from outside users. Being more familiar with the problem domain and the people most affected by it can certainly go a long way towards building something people can get excited about.