How are you using ranks?

I'd like to hear how all of you are using Ranks (Level 1, Level 2, etc) in your community. We currently don't utilize ranks beyond the out-of-the-box settings, as we haven't identified a good engagement use case for them that is relatable for us.

Please enlighten me with all the ways you're utilizing the Ranking feature, what you call your ranks, how you promote ranks, how you reward high ranking members...GO!