My sales agent used to call me like 3 times a week until I turned in the survey, to make sure I was going to give the highest ratings. Haven't heard from him since!
Also...included in the Hummer bag that came with the truck, was a copy of a survey, all ready filled out with the highest marks, and something like, "Hummer of Orlando is the freaking best dealership ever!!!" in the comments section. Kinda sad that they put that in there, at first I thought that it accidentally got put in there, til I started getting the calls.