I think this is mostly free publicity to acquire other talent. Engineers like to work with other good engineers. For instance, I'd love to work with Joe Hewitt

I think this is mostly free publicity to acquire other talent. Engineers like to work with other good engineers. For instance, I'd love to work with Joe Hewitt and Paul Buchheit and Bret Taylor. Firebug, gmail and tornado.py (respectively) are great pieces of software produced by very talented engineers.