You get what you pay for.
Reminds me of a story back in the 80's when I was still living in the Chicago area. Lowballer was advertising blacktop sealing for residential driveways. Apparently the job looked good enough to get paid for immediately after the job was completed, but after the first rain it was obvious to the duped homeowners that the "deal" they bought was actually black latex paint applied to their driveways.
Dealing with people on Craigs list has been a disappointment 99% of the time. Craig's list clients are always looking for something for nothing.