I have worked at some places that hired folks with only a high school diploma, if that. These were some of the smartest people I've ever known and they were definitely good enough to make it without the diploma. If you are truly amazing at what you do then any employer would be happy to have you. You just have to demonstrate it.
That being said, it is more than worth it to take an honest look at yourself. Are you really that good, and if so, would it come across to a stranger? As many people have pointed out, the degree is not strictly about what you learn, it's a chance for you to prove what you are capable of. Also, most of the folks I'm talking about started doing this stuff before formal tranining was as pervasive as it is now.