Ever been sponsered???

Has anyone here ever been sponsered by a perfomance store?? Im going to but i wanted to make sure it is a good idea. They wont be paying me cash but they are going to give one upgrade(under $200) free, after that 40% off anything but turbo or s/c. the deal is i have to put their vinyl logo sticker on my car (3' by 3') What do you guys/girls think???