Very well put and interesting. Welcome to the forums, Aaron!
Backing up your theory on motivation and emotion being inseparable, those who have found their calling in life do not need external motivation as they care so much about it that motivation is always there. They are full of energy and roadblocks do not set them back easily.
Those are some good ideas, but for the second idea, I'd need to make a lot of posts on other forums before anyone would see my signature. It would take a lot of time and effort.
I'm not sure if I want to do that, maybe I'll buy some ads and see if that brings in more members.