Could there be a good reason?
Let's say that Creative have not fucked up and everything is going to plan.
That means their Vista drivers are crap on purpose.
Of course they don't want anyone to fix them, they are supposed to be crap.
BUT WHY? What possible motive?
Is it to keep vista from gettting better? Surely someone else will have a sound card which works well in Vista.
Perhaps they have a fantastic new product in development which is really almost the same product but with better drivers? Now that would be money for old rope.
On the other hand maybe they are trying to devalue the company ready for a takeover.
Someone once said never attribute to malace what can be explained by incompetance. That is how most people think. I have started to attribute malace where once I saw incompetance. It seems to explain a lot these days.