GitHub:FI was really built with large customers in mind, places with tens to hundreds of developers bridled with restrictions that prevent them from hosting their code on GitHub.com.
There's no reason smaller companies can't use it, but for the time being we want to dedicate more attention and support to fewer well-paying customers.
We may offer a pricing model in the future that's more affordable for smaller teams, but I can't state emphatically enough that if your team doesn't have the type of restrictions mentioned earlier, you should absolutely be using GitHub.com.