Version 1.0 means never having to say you're sorry. Churn, baby churn. Just building it doesn't mean they'll come. Let your customers test drive the product for free. Look for evangelists, not salespeople.
Evangelists have the customers' best interest at heart.
Let your products and services be used in ways you didn't intend. When Avon learned that one of its skincare products was widely used as insect repellent, it didn't hesitate to promoted the product for that purpose. Eat like a bird, poop like an elephant. Eat information like a bird eats food. Rather than hire market researchers, gather your own data first hand.