I've been a full-time freelance writer for 20 years. In the last four years, I've found a lot of work on Craig's List. A lot of that work is grossly underpaid (there's a surprise) but even the gigs that pay decently often have unrealistic expectations attached.
Mostly those expectations have to do with time-frame. Either the client (who has been sitting on the idea for, oh, a decade or so) wants something done by the weekend; or the client grossly underestimates the amount of time a project will take.
"Should take no more than a few hours" is a phrase that's popping up more and more.
Today it came up in an ad for writing 50 "job descriptions" complete with photos that had to be sourced. Seriously? Even if these job descriptions only take three minutes apiece, that's 150 minutes.
I think the problem is that secretly, most people think they could write if only they had the time. No one ever says, "I could do that heart transplant if I had a couple of extra hours," but people always say, "I'm a pretty good writer."
My feeling? If you can write it yourself, do so. But if you can't, don't devalue my work by telling me it's something I can just toss off.