I've fried my own fries many times. It's a pant load of pain in the ass. I'll usually chunk up potatoes, toss them in bacon grease and air fry them and that scratches the same itch, but if I want deep fried I am buying them (or mostly not because everywhere uses vegetable oils) because a man can only spill oil all over his stove so many times.

e: Actually now that I think about it I haven't done any deep frying since I've become a seed oil disrespecter and tallow would be easier to clean because it's solid at room temp.