Perhaps I'm in the minority but I have actually setup my home system to use SSO (backed via LDAP).
It annoys me no end that all these services seem to think that charging to maintain my userbase is a way to get me to think they care.
What it means is it invariably the SSO support is barely tested and poorly documented. For a number of products, I've tried out the "enterprise" version and realised that their features (e.g. SSO, audit, etc.) are just not useful.
Largely because there are not enough people looking at the thing or attempting to use it.
Please note that LDAP group sync is part of Enterprise Edition, but I assume your home system doesn't need that.