Apples and oranges. Yes, there is a "hot girl effect", but it really only applies to hot girls. People who are at the top of their fields may be friendly, but they are, by virtue of being at the top of their field, generally very busy people. Sure, they're approachable, but you can't really expect to have more than a small slice of their time unless the ideas you are bringing to the table are of significant interest to them. The CEO or top scientist is inherently busy or they wouldn't be in their position. A hot girl, by contrast, is no more or less likely than anyone else to have a full calendar. Hot girls don't automatically lose their hotness by living a relaxed, unstructured lifestyle.