Launching Your First App (from someone who has)
sixrevisions.com
sixrevisions.com
My apps, for example, are in a crowded market where I've calculated that there's at least $140m in VC money.
https://h4labs.wordpress.com/2015/07/15/top-5-start-ups-crea...
And some of that money buys television ads:
http://www.ispot.tv/ad/7Nku/babbel-learn-on-the-go
The app market grew up fast.