While collaborative business modeling (CBM) constitutes a promising new approach for opening up a company’s innovation process, existing literature lacks empirical evidence of the effects related to this approach. Drawing on related literature on the quality of creative output, this paper proposes that in the context of a CBM initiative, the integration of customers will improve the quality of the generated output. As indicated by the results of our empirical evaluation, customers are indeed capable of developing high quality business models and are able to outperform company experts when it comes to the task of developing new business models.