They love/care about their fanbase and they are single-handedly keeping the PC gaming market up and healthy. Steam is such a fantastically convenient and decent store front when most high-street retailers are having smaller and smaller sales areas for PC games.
The only complaints I have with Steam is that A) The prices are bullshit for a lot of titles but that's because the publishers control the prices, Valve just hosts them and B) I have so many games on Steam, my copy gets unresponsive and glitchy when I'm downloading new games which is only really a problem during their fantastic sales. Also, I have bought many games a second time on Steam because it's more convenient than looking through the boxes for the CDs/DVDs.
http://steamcommunity.com/profiles/76561197968099168/games?tab=all