This is why mediocre products with mediocre marketing make bank. The games industry is very competitive, and so is the iOS app market. But that's only a tiny percentage of the software market (measured in dollars). Where are the thousands of Gmail competitors? Word processing and spreadsheet competitors? Where is a better DabbleDB? Nothing has changed in the past 5 years, and in any of these markets you can simply win with a better product and half-decent marketing. And if you make a product for a specific vertical it's even easier.
It's not like Patio11 is the first guy to ever make Appointment Reminder software. Or the 20th. But with half-decent execution and half-decent marketing he's still making a ton of money. And is he afraid that by posting on HN people here are going to start competing AR software? Of course not. Because there are so many better opportunities out there that there is no need to fight for the same customers.
How many startups do we see coming from Spain, or India, or Brazil? Very few. How many from Milwaukee? I don't know of any. But the software engineers exist. The opportunities are right here for the taking. But people just don't take them.