Many very good engineers don't do open source. Not to mention that as an employer, ideally people you hire put close to 100% of their development time into thi

Many very good engineers don't do open source. Not to mention that as an employer, ideally people you hire put close to 100% of their development time into things that benefit their primary employer. Hiring someone who is a hard core open source contributor could actually be a negative, because at best the day job will get 75% or so of his attention.