Like illegal drag racing and unprotected sex, all you ever hear about selling your soul are the negatives: in this case, an eternity burning in Hell for swapping Satan your soul in exchange for unlimited Crunchwrap Supremes. But today, dismount from your moral high horse, and consider what your soul really does for you day-to-day. Unless you routinely visit a pulpit or temple, probably nothing. However, Beelzebub definitely sees the worth in your eternal soul and, they say, "Surround yourself with people who recognize your value." In that case, what is your soul worth?
Plenty of famous people sold their souls, most of whom chose wisely. Not only did they swap their crummy souls for spectacular abilities, they also gained a kind of immortality that comes with ditching your soul and getting awesome. If you find yourself lucky, at some point Satan will appear on your left should and teach you how to sell your soul. So you better have something decent in mind or there'll be Hell to pay, but that just goes without saying.