There are 100 titles up for sale on the Linux steam side.
I imagine that how much content gets made for it is directly related to how many more Steam accounts they get and how much additional content they buy.
I spent $25 on additional games on my Steam account for additional titles - directly from Steam for Linux. They have a 50% off sale on Linux titles. Also, my old already purchased games that now have Linux versions installed for free - as it should be.
So - if you're a Linux inclined gamer - which I'm sure there are a few around here, step up and show that we're not an uncountable minority. Most of the Linux compiled games are in the $2.50 to $15 range with the sale on. We've all paid more than that for tiny app games on our phones.