^^^ I personally don't like laptops but people use them for their mobility, fair enough.
That said, most people will use them in the home a lot and the ability to plug in a gfx card and play games at home is a good thing.
If you're using it for it's mobility ie out and about at work, you'll hardly be playing games. Then, you come home and play a game.
Laptops suffer heat problems and the ability to have a high powered external gfx card is better than trying to stuff one inside and cook everything.
Besides, you may think it's pointless but I'm sure the manafacturers feel there's a market for it. A lot of reviews/comments on that site seem to give it positive feedback.
Back on topic, I think many people who don't know much about pcs in my experience get attracted to Dells website from such things like cheap prices and words like DVDR, TFT, 1gb RAM, 64 Bit etc but without realising they aren't the easiest things to upgrade. That said, for many people they do a perfecly good job.
