I'd also add that Brent Ozar, Pinal Dave, Grant Fitchey, Catherine Wilhelmsen, Steph Locke, Jen Stirrup and many others are highly visible in the DB community. Such involvement brings its own rewards but also is good self marketing for your career.
I've got a lot out of being both a mentor and mentee. I find I learn more than I teach. I'm about to start a new position in a new company and on both sides of the table it was reputations that led them to offer and me to accept. I'm going to be working with people I know are exceptional