[strelok]

I bet you can still make a lot of money using this method if you focus on some emerging trends though. Look how many One Direction apps are out there now. I counted 38 results after searching "One Direction". If you get in early, you can make off with a few 10s of thousands.

[sireat]

How many of those trend chasing applications really make money though to make it worth developer time?

It is easy to interview a successful app developer out of the sea of unsuccessful ones, just like Tim Ferriss did.

Disclaimer: I had to google what One Direction is (NKOTB was hot when I was growing up).