There's nothing wrong with continuing to ride a gravy train you know is going to end (or at least slow down) as long as you don't convince yourself it's going to keep going forever.<p>&#62;I want other type of things that do not require much time investment, but give as good returns as that.<p>Why do you not have time?  I presume you are referring to the time required to, say, manage rental properties?  You've  already proven that you're very good at creating software users want to BUY(!), so why not take some of the time that this money affords you (pay a maid, etc.) and figure out something more substantial to build while you're still able to milk the app store cow every morning?