In one sense, that feels like a dream situation for any freelancer. He has a constant, reliable source of work, every day. He doesn’t have to spend time marketing his business. He doesn’t get stressed about finding new work each month.
Not so fast.
If you think about it, he’s actually in a horribly vulnerable position. I have had clients like that myself. Sometimes they stay with you for a year, or maybe 3 years, or even 5 years. But they’ll never stay with you forever. Companies are bought and sold, key staff change positions or employers. And so on.