To achieve success or even the idea of it might surprisingly scare some people. They are afraid that success will change them. And it does not help to hear examples, stories of such nature being fed around the main society. It creates this negative cloud around achieving success that perhaps have a subconscious effect on some. The way to look at this is that how one behaves after achieving success is just an extension of how one is as a person right now. If you have good values and generally a good person before, you will likely use the newfound success is a positive light. So instead of being afraid of success, focus on becoming a better person.