Yup, thats pretty much what I do. I make a whole slew of potions then I go into to town and sell them all. The only things I do use are the spells I learn. My favorite thus far is the Heat Wave and Electric Touch. I also use the Major Life Detect spell a lot too.
I am an assasin as well and sell all the potions I make. Seems that my dwarven bow and dwarven sword of scorching along with my modified blade of woe make short work of anyone that needs killing.