I take them because I can. At the end of the month when I look at my spreadsheet and I see 4 figures it makes it all worthwhile. I especially like the meal shops even if the shop is low or zero but they reimburse the meal I think, well im going to go eat somewhere or at home and if I go eat somewhere im going to people watch as i eat...so why not do what i would have done anyways and get paid for it.
Other than that I really dont know what people that ask the question "Who does the $15 shops?" want to hear. Different people have different preferences...I wont do gas station shops. Never done one, no rhyme or reason why I dont like gas station shops. Just dont like them.