Does this bother anyone else? Before I buy a card, I would like to check out the breasts: fake? too small? too big? I just won't take a chance on a card if I can't preview them, and most of the demos now don't show nudity

No demos have any nudity in them, gotta pay to see the goods. DeskBabes on the other hand does show you a few nude clips. But if you really want to see what the girls look like naked before you buy, just search them online, try freeones.com they got a very big collection of galleries and vids.

Only time you see breasts is when the performer is wearing a see through top. Or occasional nipple slip.

If they show too much in the demos who will purchase?

I'm a legs man myself, and they aren't afraid to show those in the demos. If you really want to you can find pictures online for many of the girls, prier to purchase, but might take some research on your part.

search her name on for example indexxx.com??

and as DMon said, who would purchase if there is already too much show in the demos

I usually check out the bonus vids for the full physique.