It appears that non-profit groups are not counted in the number of usages (according to the Terms of Service). I just want to clarify before making recommendations.
Re: Licensing question: Multiple Schools, single license
Posted 17 years 1 month ago
My understanding of the license is on a domain basis. So you should be able to have multi sites on the same domain and use the same license. However, best to email support for clarification.
As for non-profit, they do not count against your licensing limit. Basically, charities are exempt.