They send an email confirming that a shop was completed. If yopu don't get that then the shop wasn't submitted completely. (Their submit partial/submit completed options can be confusing...)
I do a lot of shops for them. I don't pay to be a "highly rated" shopper. I get enough shops from them that I haven't felt I needed to do it.
I gather they are really seperate franchises--DC, houston and florida though I think DC and Houston are now owned by the same person.
I like working for them and I think they are fair.