That's true, but my lower rig already has 4 cards with no risers and running at a comfortable temp while being overclocked. Just the upper rig doesn't have the other cards installed yet. And I took my pics when making the upper rig. But I was already thinking of something like this for card expansion in case I ever go that route.

http://www.metalsdepot.com/Cart3/viewCart1.phtml?LimAcc=&aident=