...(Someone really needs to make Evil Genius 2)...
Why yes they do! And if they whip me up a Dungeon Keeper 3, I'd have my christmas purchases sorted.
Anyway, I always find it interesting when Valve and other companies start talking numbers of accounts, not because of trends or some such, rather because of the type of numbers and their word plays usually show where the company is or is headed. Usually, given the difference between an Account Holder and an actual Customer for example, the company will go with the larger number to use the good old fashioned 'popular kid' trend. World of Warcraft, for example, doesn't provide any offical details about it's current numbers - it's last stated customer base was 11 million Active Accounts. Considering that their server problems in China cost them around 50% of the Asian player base (roughly 3 million or so players), that number is significantly lower. Blizzard won't state this, because they want WoW to remain the 'biggest'.
Valve stating that they have 25 million active accounts is very different from saying they have 25 million active customers, and in trying to use word-based gymnastics to promote themselves kind of gives a bit of insight into whats happening - Valve want people to think Steam is a massive force within the industry, and while it's the largest DD Platform, it's getting the table scraps from the retail market. Clearly, Valve want to go much, much bigger - adding Active before accounts simply shows that Valve want to make it clear that it's 25 million accounts being used, not simply registered.
I use my Steam Account daily, currently playing Torchlight to death, but I
only buy things on Special and I use Steam as a method of obtaining games for as cheap as possible - some times ebay is cheaper (Mass Effect new for 360 for AU$15.00 with postage) and so I'll shop there and I avoid any non-Valve Steamwork title like the plague. Any attempts to data-mine some kind of marketing trends from their 'active users' to better promote their games on Steam or promote to Steam to others falls down when dealing with tech-savy gamers because we're used to blocking out pop-up adds and the in-your-face marketing Valve use on their service. Most gamers use DD like Steam to get was what promised; better games for cheaper prices - actual getting the trade-off for not having a box or physical manual. Unless the number next to the dollar sign is low enough, I suspect many of Steams customers don't even notice most titles unless they're looking for them.
My two cents worth.