Having only been around for a few weeks, I can only comment on the engagement aspect of this.
Who doesn't love it when he's being engaged?
It shows how relevant your presence is and also how impactful your efforts are. I must say, of a truth, having those conversations flow are the biggest values generated here.
I guess many people consider the money as the main prize, but the truth is that this is just a (great) side effect for all the efforts that are made here.