There's no email address or Amazon wishlist, or other such way to pass on complements like, "really cool job, I'm using and liking your software."
Thanks a bunch!
+1. While issue not closed, thanks guys.
The only thing I got is a gittip account which you can find here: https://www.gittip.com/on/github/primus
I'll add some information about this in the documentation soon.