What kind of survey are the speakers discussing?

W We just received this consumer products survey in the mail. Do you think we should fill it out?
M Why in the world would we want to? It just encourages those companies to send us more surveys.
W Well, it says that if we fill out this simple consumer products survey, they’ll give us coupons for all sorts of things. A $100 worth of coupons, just for filling it out.
M Okay, go ahead and fill it out if you want, but I doubt that the coupons will be good towards anything we’re interested in.