First of all, it's too expensive. $7 for 5 repos? I'll use bitbucket instead and keep github account for opensource projects. Probably price should depend on a number of collaborators and some special features.
I am confused, if I am google apps oldfag and have 20 accounts. According to http://support.google.com/a/bin/answer.py?hl=en&topic=29... can I still use it like before or I must remove 10 mailboxes to fit 10 requirement to continue free usage?