I do believe a lot of SBs want supplementary income. They have a real job or go to school. The extra 2-3k a month is great for them. So getting $200 for 3 or 4 hours for a relaxing time a couple of times a week is a good deal for both parties.
I have one I am about done with, but became to entangled, stupid me, but it has been fun.
Variety is good, but there are so many hoops to jump through when seeing new providers and the whole slam bam thank you ma'am mentality can get old as well.