Sorry Amerikaner, but you're off in fantasy land on that one. Steam would be in the business of selling indie and their own games ONLY if they did things like demanding DRM get removed from any titles they sell. All the major publishers would tell Valve to go **** themselves six ways from Sunday, because none of them are going to pay to strip DRM out of their product just for Valve.
As for Prima guides....*shrug* it's a revenue stream for Valve and Prima, small though it may be. In the less-opinionated world of gaming, Prima is providing a 'legitimate' service. They have the publisher and the developer's stamp of approval, since Prima gets early access to the games they cover so they can write the guides in the first place.
(And that's the only reason anyone even gets them...because that's info immediately available as the game releases. Nevermind the fact that so many new releases are so simple and short, you don't NEED a strat guide to pwn it to being with.)
I remember the days when guides were AWESOME and useful, before the Internet made finding something out almost idiot-proof. So I look at Prima and just kind of shake my head sadly. It's getting railed twice by the Internet. One, the internet is kicking print media's ***. Two, the Internet is kicking gaming guides' asses too. So trying to make 4000% profit on strategy guides that everyone but noobs don't need by selling them on Steam...it's desperation on their part. But they have the right to try and stay solvent when the odds are almost totally against them. Sort of like people have the right to pay for something they could get for free if they were a little smarter/better informed/motivated.
And I do think there's some joy in reading a strat guide, when it's high-quality, both in presentation and in content, and the game is worthy of having a strat guide in the first place. But that doesn't happen very often any more.