To be fair, I must add that this is only part of the success story. 

The other vital part missing here is the opportunity recognition by Steve Jobs, followed by their marketing and innovation of assessing the opportunity, developing it and sustaining it as a viable and enduring commercial reality eventually. 

That's to say, the ultimate fire test of success came from the latter. 

This is not to imply that Steve Wozniak's humble beginning in the techno-wizardry wasn't important.