In my area, I find the jobs appear in batches. There may be a dozen or so in my area one month, all different types of shops, then I don't see any again for two or three months.
I find them great to work with, but some of the fees are low for the amount of work involved. But they pay fast and if you do a good job on the report, they're sure to e-mail you and thank you! Not that that pays the bills, but it's nice to get a personal "great job" e-mail once in a while, not just a comment in a box!
I learn something new every day, but not everyday!
I've learned to never trust spell-check or my phone's auto-fill feature.