Scrypt-Based Mining now is just generally dead. I don't see the point anymore, even if you have Mh/s, you're still losing a LOT with electricity costs.
Some people have access to really cheap or even free electricity.
^^^THIS!
Plus also depends on WHAT GPU you are mining with...not all GPU's are created equal. There are a couple super efficient and effective cards for mining scrypt and I would imagine they could mine x11, groestl etc just as well.