In this modern age we should be able to offer something like "micro-stocks" to customers. Like a "our product isn't there all the way there, but you use us because you believe in us so we promise that if we are successful we'll pay back the people that believed in us".

Even if the fractions are so small that it only amounts to cents, early supporters now have every incentive to tell ALL their friends about it and root for you however they can

As a customer you also get the piece of mind that later price changes won't be unfair to you. You know that you were somehow compensated for your early commitments. In fact you even stand to benefit from all the new customers price drops could be bringing in