In a gold rush, the guys who do the best are the ones selling picks.
RubyMotion is a great recent pickaxe example. Write for the App Store using Ruby for only $150 now or $200 later! Buy Now!
When I consider how much time they took to write I would have been much, much better off spending that time on oDesk contracts at $20/hr, and don't even talk about what I could have made on a real developers salary in that time.
Selling your own apps now is a fool's game. Apple trumpets the successes because it helps them sell hardware.
Perhaps the iPad music category is too niche, unless you can justify a high price-point.
Some music apps make do really well but they're generally much less complex and technical than mine.