Sounds like personal preference. This site is for natural selection. If people are interested in it then it will get voted up. Voted Up because I've often wondered it myself
Well-Kept Gardens Die By Pacifism.
http://lesswrong.com/lw/c1/wellkept_gardens_die_by_pacifism/
I wonder if that's a symptom of HN's widening userbase, or if it's a sign of the times. Back in 2007, the startup market was very glutted, and a lot of people (including myself) were founding companies who probably should not have been. Now, it seems like every top developer's dream is to work for one of the Big 3. I wonder if that's a sign that it's time to start founding companies again.
I think for the most part that it is because they're simply leaving.