When I saw Bill Kalush at the launch of the Global Titans, he showed me these in a plain version. I think it's a great idea for travel, especially if you're carrying around a rare deck or an expensive trick deck. It's a simple, thick paperboard jacket that completely surrounds a deck in a way no Porper clip does, giving the box as much protection as the cards.
These are common-sense items. For a collector, cardist or magician to not have a few would be like buying a professional-grade camera but opting to carry it around town in the factory box instead of a protective camera bag.