There aren't as many resources out there for developers on the business side. The excellent Release Notes podcast and Under The Radar are often the best places to learn how to actually make a living on the App Store. In these two episodes of Under The Radar, David and Marco discuss treating apps as an annuity, or long term mostly passive revenue, and selling them for a profit. If your heart isn't in it, selling may be the best option!
Under the Radar: 71 & 72 Apps as Annuities & Selling Apps with Marco Arment & David Smith