Why should I demand a luxus edition of a Porsche if I don't even have the money to buy a new car?

The DX7/8 situation is different than DX9/10.

When Conitec switched, they swiched from an old DX version which was not standard anymore. DX9 still is standard and will remain standard for quite some time.

There are several people who don't even want a switch to DX10 as this equals a switch to Vista. In my case, this would force me to switch to another game engine.