I've long said that the computing field is one where you can make decent money without a degree. I think a lot of that is due to how people in my generation started out tinkering in computers as a hobby and that mindset has still continued. Computer people value ability over certifications and degrees.
That being said, those pieces of paper open more doors (especially at larger corporations) than not having them. But it is quite possible to be gainfully employed at above median income levels without ever having taken any formal training in computer.