Yes I could build my own GPU rig but I have satellite internet and I wouldn't be able to game with it. I thought an asic would be cheaper to get and more profitable.
The best GPU rigs aren't good for gaming anyway. GTX 750Ti is the best mining card and it does not support SLI. It's a decent card, but not really harcore-gaming-grade...
ASICs are indeed cheaper to buy, but less profitable if you pay for power (ie, in the summer)