A hobbyist is one who produces or makes a product for the love of doing it. They are not trying to run a business or make a profit from their passion.
So even though it costs money to pay for being listed as a "hobbyist", the person is not allowed to make profit from it? Or, more to the point, if they do make a profit from it (not making a living, but a small profit to make it worth their while), will their "hobbyist" status be yanked?