Uwe Eichert of Academy Games discusses managing a customer base and building niche markets on two episodes of Funding the Dream (@FundTheDream):
http://www.buzzsprout.com/4646/141455-ep-178-uwe-eickert-with-academy-games-building-a-customer-base
http://www.buzzsprout.com/4646/142771-ep-180-building-niche-markets-with-uwe-eickert