Here's the thing. The company I work for deals with graphics and 3d animation as well as video designing and editing, so a top-of-the-line graphic card is a must for me (the 780m SLI comes to mind). I did consider a desktop because I know I would get more value for money, but it simply isn't portable like a laptop. I would have to carry the tower, the huge monitor, the keyboard, the mouse and a ton of cables over to my workplace on a daily basis and then I have to reconnect and set up everything there before returning home and doing the same in my home.
As you see, it will be too much of a hassle. A laptop, however, can be easily loaded in my car and brought home without worrying about cables and all that stuff. Besides, I am also an avid gamer (something I do every weekend), so the laptop can also satisfy my gaming needs without compromising portability. That would be the reason I am gunning for a laptop and not a desktop for my daily needs.