Dave told me privately (when I was interviewing to write for FG) that one reason they have such a hard time hanging on to writers - mostly the ubernerds who write like 2 articles that are full of giant charts and then never appear again - is that MLB teams keep hiring them. Kiley was hired by the Braves, of course, and Dave has a similar network of industry contacts. A couple GMs have appeared at FanGraphs events (I think at least Cherington and Luhnow). And there are a dozen or so MLBers who read the site regularly (Brandon McCarthy comments on articles about himself).
I think Sullivan's series on how to pitch to Mike Trout was pretty influential.
Houston, submit some articles and get hired!