Some other resources to check out:
http://www.quora.com/LEGO/What-percentage-of-LEGO-fans-are-a...
http://gizmodo.com/5019797/everything-you-always-wanted-to-k...
"When we design sets, we take both children and adults into consideration. Children are our primary audience, especially as it relates to the core play theme sets; however, much of what appeals to children in today's Lego sets has strong appeal among adult fans as well. With Lego Star Wars, adults are equally considered. In designing any set, it's about the balance between the building experience and the play experience. We do also leverage our direct to consumer channels to provide ultimate collectors sets, special exclusives, sculptures and models that are designed with skilled builders and adult fans in mind. We sometimes even invite our adult fans to help us design new sets."