The only reason why people buy bitcoin, is to make money.
It's wrong. The correct statement must be,
One of the reasons why people buy bitcoin, is to make money.
as far as I know, that person bought coins not only for money or profit. but on the other hand they bought the coin because they wanted the coin to spin, and not as long as just one side. because the progress of bitcoin also needs to rotate, from one person to another. so it can make bitcoin even more advanced.