And it only takes few minutes to install and benefits alot.
Actually it benefits nothing and the time it takes is directly proportional to how fast an internet connection you have. Its VERY hard to find a game nowadays that doesnt require DX9, so whats the big deal?
Really? I'd hazzard a guess that you aren't looking very hard. If user is too lazy to install library that almost every new game on the planet requires, its their problem.
What about "If you can't see the point of doing it, because none of your other games need it", and you certainly aren't going to install it because some unknown person on the Internet has a vaguely amusing game you might be interested in, when you'd rather be playing Diamond mine anyhoo. and all GFX cards in the whole universum supports it.
Not all of them. In fact I've seen quite a few BRAND NEW LAPTOPS with sod all OpenGL support. And btw, forcing people to upgrade to DX9 is good thing, cos they are going to need to do it sooner or later
You are not forcing anyone, and people who mainly use their PC for word processing, e-mail and the occasional game of Freecell or Diamond mine is NEVER, EVER going to need DirectX9.It a competitive world, and if you aren't willing to do better than everyone else, you won't be in business very long.
Even my UBER UBER old computer, 450MHZ pentium III has OpenGL support, WinXP and DX9.
One of my mates' brand new Zepto 3GHz laptop, doesn't do OpenGL very convincingly. In fact after running an OpenGL application it is often nessecary to restart WindowsXP.