Generating click throughs for statistical and analytical purposes is one of the major reason it's like this.

You can always right click and open in a new window or middle mouse click to do the same.

Since Steam will not allow us to own the games, I could not care less about being 'a number' for them. I agree with others who have expressed the opinion of wanting an Add to Cart button on every game page.

As a disabled gamer, not only is it difficult to go through all the clicks to buy a game, but it can be very painful as well.