Github charges you for private repos. It doesn't matter the size of the repo or usage of the repo… just that you have a dang repo.

Their price structure is the following:

$7/month 5 private repos
$12/month 10 private repos
$22/month 20 private repos

The pricing structure is ridiculous for my use case of making many small mobile apps for different platforms.

Queue some blaring horn intro music… Bitbucket has free unlimited private repos! Let me say that again… FREE UNLIMITED private repos! Also, they support mercurial and git!

Bitbucket is awesome!

Disclaimer - 
I do want to throw a disclaimer out there… I love Github too… just not their pricing structure for private repos:)