Judging from the folks on here who have had experience with this kind of survey, I'd do it if offered the chance. It's a few minutes of your time, it helps the quilting industry have a sense of what quilters are interested in and how to provide those things, and, who knows, you might help shape what goes on in the quilting world for the next couple years!
I know I participate in some online surveys for which I am rewarded with copies of biannual quilting books. They are published by BHG and usually run around $10-12 when I see them at the stores. Many times I find they are compilations of quilt patterns I've seen in my mags, but it's nice to have an variety of patterns with common elements or themes. Surveys, in general, don't bother me. Plus, like several have mentioned, you don't have to answer questions you aren't comfortable with! Have fun!!