Steam requires to provide finished product and support. Apart from the libre games, there's a bunch of Linux ports that will never get into Steam because devs can't/don't want to support Linux beyond porting their game.
Been ages since Steam have learned to detect wine, so probably it is in "Other"
Humble Bundle is not an indicator. It's great that Linux users spend more, but if you'll take Windows or console game market in account, $2 per game spent by Linux users is nothing. All these games on Steam together worth around $60.
This. Though it's more like "in past 15 years". I don't think I'll ever be able to ditch dual-boot, even though wine runs many games just fine.
KDE4 runs just fine with 512MB RAM and modern Android devices have even more. If you'll read the thread you've linked, you'll see that it's an openSuSE issue which has a lot of pre-enabled KDE components that are not needed on a tabled (like semantic desktop).
Who said there was profit in consoles?
Probably the fact that consoles are competing with PCs on a videogame market. For end user, consoles are cheap and easy to maintain, that's why people buy them.
I've been using GTalk for years but it kind of sucks when you're using it with 3rd-party client. Most of it's features and XEPs are GTalk-exclusive and at the same time it doesn't support popular modern XEPs like "publish tune".