I really don't understand why you are making this argument.
There are plenty of DMs (as this is a growing field) that are hustling to make money. It's a job. People need to make money.
There was an article last year about a woman who, when unemployed, supported her gender transformation by DMing on-line games because she couldn't get employment through regular means. I know someone who currently works at a Dunkies during the day and makes ends meet by DMing for pay (on-line) at night.
They don't do it because it's fun. They do it because they get paid.
Just like everyone else who works. We work to get paid.
While I wouldn't work if I didn't get paid, that doesn't mean that I don't enjoy my job. At least a lot of the time.