The lowest hanging fruit in the business myth category is clothing. The most successful, wealthy, and interesting business owners that I’ve met do not fit with the projected image of an athletic man in a power Armani suit. This is not to say that there are not highly successful people who dress like this. There is no doubt that they exist. It’s the idea that you need to dress like this in order to be successful that is simply a myth. (Need an example? Here’s a search for “businessman” on Google images)
It is possible that this is purely a web industry phenomenon.