Entrepreneurs increasingly use reward-based crowdfunding to finance innovation projects through a large number of customer investments. The existing academic literature has predominantly studied factors that drive crowd investments and whether crowdfunding predicts market success. However, we argue that the involvement of customers goes beyond the provision of capital. As investors, customers enter into a principal– agent relationship with entrepreneurs. Thus, entrepreneurs are often faced with a crowd of customer investors who try to influence product development. We show that entrepreneurs can benefit from this influence, because customer investors provide some of the support usually received from institutional investors. Greater involvement from customer investors thus increases funding success. This holds when we control for creator ability and project quality. The effect is driven by customers’ influence on product development and the reduction in agency costs for prospective customers. We also link the involvement of customer investors during crowdfunding to the crowdsourcing literature and show that its positive effect is augmented by the elicitation of external information through distant search.