That's nice that they pay you. I would probably still not have questioned not getting paid in that situation...and I am not a new shopper. :-)
Their shops are relatively easy, they compensate fairly for them, they pay on time using paypal, and I have never gotten so much as a single question about anything, good or bad.
I would say that I like these people a lot. I can't say "love" because I really dislike the web forms they use. For the shops I do for them, it is 100 questions, starts with an overall narrative (I do better writing when they are at the end-I don't know why.) Then you have to confirm each question before going on...and it's a bit slow going.
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“Lying in bed would be an altogether perfect and supreme experience if only one had a colored pencil long enough to draw on the ceiling."
~Gilbert K. Chesterton