For another perspective (perhaps a more nuanced/less flattering one), NPR's Planet Money recently did a great episode on Netflix's work culture [1]. I'm not so sure I'd want to work there, but I'm sure it is great for some.
I was wondering the same thing -- I've tipped a few times but it's always been a couple bucks cash since I've never seen any option for it in the interface. Maybe there used to be a way to tip from the app that they've since removed due to such complaints?
I didn't particularly like the article since I couldn't really tell what the research was about from it, but I'm enjoying listening to Jeremy England's (the guy behind the theory the article discusses) talk that it links to [1]. Until at least 19-20 minutes in it's presented simply enough that a 10 year old could easily follow along with it, then gets into technical stuff that is kind of going in one ear and out the other for me (as somebody who hasn't studied physics beyond a college survey course level).
[1] http://www.npr.org/sections/money/2015/08/28/435583328/episo...