Most of us writers need to make money, since few of us make enough from fiction to buy lunch, much less support ourselves (much less support ex-wives, college-attending children, expensive tastes in alcohol, etc.) So we have day jobs.
Mine is freelance marketing writing. I really like it, and regularly recommend this line of work to fellow writers with an inclination for it. It involves a lot of the same skills, in addition to the writing part: understanding motivation, creating suspense, leaving things to the imagination.
It's also got the feature that your clients can suddenly need what you're working on more than anything. One of my clients suddenly got a lot of pressure to generate a huge amount of marketing content, all at once, and with ridiculously short timelines. So she wrote me an email with lots of caps in it, got me a purchase order, had me invoice, and put me to work.
I have no idea why my client's higher ups only figured out they needed this stuff two weeks before it had to be in the hands of the sales team, but if you've ever worked at a large company, particularly one that has recently acquired large numbers of other companies, you know that everyone is barely keeping their heads above water, much less calmly looking ahead a few quarters to see what they'll be needing to get things over the line and make their numbers.
On the other hand, if I write fiction, someone will read it, but no one is really breaking my door down for it. So I won't lie: it's nice to be wanted.
And, as always, doing high quality work on deadline is the only thing anyone will pay for. Mediocre crap turned in late is somehow not a hot commodity.
But the fiction is still the first thing I do in the morning. I just have to give it a bit less time when deadlines loom. And the book is going pretty well. I should write about that at some point.