Every job is important and a common salary for everyone would create equality.
How many people are alienated from and looked down upon for wanting to be a bus driver or farmer or any job that is not doctor-like or lawyer-like?
How many people actually choose their jobs because they actually love it and not because of its salary?
Imagine how many people would be free to choose the job that are really passionate about, maybe even you.
Yes, initially some people would want to do nothing for a while and that is okay because doing something you never liked for so long requires some personal reflection to reevaluate your life and to really think about what is important but eventually you will become inspired, excited and then want to DO something; to be productive.