User toolkits for innovation were recently proposed as a means to eliminate (costly) exchange of need-related information between users and manufactures in the product development process. The method transfers certain development tasks to users and thereby empowers them to create their own desired product features. This article examines the implications of different levels of opportunities for consumer involvement (OCI) in product development to learn what happens when firms pass design tasks on to consumers. It explores this issue by studying the relation between the employment of user toolkits and the need for firms to support their consumers. An analysis of 78 computer games products and the amount of support given by firms to the consumers of these products suggests that a share of the costs firms save on information acquisition by letting consumers "do it themselves" may eventually reemerge as costs in consumer support. In other words, an increase in opportunities for consumer involvement seems to increase the need for supporting consumers. A promising solution to the problem of support costs is identified, namely, the establishment of consumer-consumer support interaction. A case study of an outlier in terms of firm support to consumers-Westwood Studios-shows that consumers who use toolkits may be willing to support each other. Such interactive problem solving in a firm-established user community is advantageous to the firm, because the process reduces the amount of resources that the firm itself needs to dedicate to the support of consumers using toolkits. Generally, consumer-to-consumer interaction can facilitate problem-solving in the consumer domain, can aid the diffusion of toolkit related knowledge, and potentially can enhance the outcomes produced by the toolkit approach.