On the surface, this might seem like a nonsequitur, since in a sense Android is Linux, but the ecosystems are different.
On Linux there are a host of utilities and applications, all full-featured, and FREE in all the senses of the term.
Yes, there are free apps for Android, but most are shadows of their incarnations on Linux, and beyond that, the free versions are typically crippled in one or more ways to encourage you to buy the PRO (or whatever) version. Example: the Jota app I mentioned only allows 2 files open at a time.
So Android wants to compete on the mercenary Apple playing field, and metrics are generated which measure Android's success by how much money is spent on apps.
But I can manage. The only app I've purchased was one that more time passed than the allowable 15 minutes for me to decide it wasn't going to work for me to decide I wanted a refund, since it was of no use to me. So in addition to my basic attitude, I now also have a bad taste in my mouth from a purchase I did make. At this rate I may never use up my initial $25 credit at Google Play.
(incidentally, this post is the first done with my Nexus 7)