Simply put, people care about the lower boards because that's where the vast majority of the forum's traffic comes from. We even have people who have come to Bay12 solely for the forum games section.
The survey is being moved to different boards to get a wider audience, primarily because there's a number of people in the lower boards (again, majority of traffic and all that) who find this stuff interesting. It doesn't matter if you're not interested, but there's no reason to bash the people who do.
Also, next year's survey will have a question about how much you like spaghetti in it, just to spite you.
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Could someone please elaborate on this "lower boards" and "upper boards" concepts? I'm assuming the first term describes an active group of users from a part of the Bay 12 Games Forum which is not connected to DF?
On the forum's main page, there are three sections (well, and Announcements, but don't worry about that). We have the upper DF boards, the middle boards Curses, Other Games, and so on, and the lower boards General Discussion, Life Advice, and FG&RP.
"Lower boarder" and "upper boarder" refer to people who post on the lower boards and upper boards, oddly enough. I've never seen the term "middle boarder" used, possibly because there's a negligible number of people who only ever post in the middle boards.