You have the method by which you can generate lots of money in a short period of time; you just proved that to us with that $24k. But you say your problem is the time and effort expended to create your apps, so I'd suggest you take a portion of your money to hire others, create more apps, and saturate the App Store. What's it to you if the App Store won't last forever? You want something quick, so exploit it while it's there.