When you have the above independently, you can say that you are a successful person. No matter you are a Domino's pizza delivery boy or you are the founder of www.facebook.com, as long as you are having all the above independently, you are successful. Of course, we can switch our job responsibility base on the ability and the improve version of yourself after you attended Toastmaster's Club for example.
We buy all these according to the fund availability. If you have more money, you buy a different brand or you choose the one which is suitable for you.