My point is when you have 100 different ways to achieve result - it's always led to inconsistency. And it's very dangerous in large distributed app because resolution of those small differences means you have to support 50+ variation of the same submit button.

Personally I'd prefer to have up to 5-10 option of buttons for all possible cases. And it's not only visual simlicity, and not only easier to support but even help your own customers because they are not have to looking for 100+ different button styles.