I have a friend, we'll call him Jon. Jon has been making apps for the past three years. He never learned to code, or design, or market, but he somehow managed to pickup xcode and started making fun apps for his nieces and nephews.
Eventually a day came when his sales skyrocketed, roughly $5,000 in a single day (a figure I made up, but he has stated before is realistic for him). Seemingly by chance. As Jon dug around a little he realized that a school -- who regularly provide iPads to students -- had bought his app in bulk.
Now, years later, he specializes in developing apps not for children or parents, but explicitly for schools. That's where the money is right now, he tells him.
You can make a lot of decent money selling quality apps or tools to consumers, but if you want to make boatloads you have to think in terms of those who would buy what you make via bulk purchases; from organizations large enough who need the thing you've made.
Isn't this how 37signals found their way?