Well, I don't know how they would have lowered an assigned job, but anything is possible. I have found the team who uses a few different scheduler ids that assigns any given job to be responsive by email. As you indicated, they tend to list the same location at many different rates.
Their goal is to get the job done as cheaply as possible. I did do four in an hour recently at the higher rate. I didn't eat much thankfully at those visits, just enough to report the quality accurately.