I've been to a few market research focus groups, and I think they are fun! As stated, just tell them what you really think and be honest. Believe me, they do LOVE to hear negative things and what YOU think they are doing wrong (often company reps are behind a two-way mirror watching and hearing the whole thing).
However, focus groups usually FOCUS on a specific product or service and they often want to know how eager you are about the new "proposed or experimental" product or service and how much you are willing to spend. Expect a lot of, "if HD Platinum were $20 a month, would you be willing to pay? How about if we added 4 more channels? How much extra a month would you be willing to pay for a box that does everything the 922 was supposed to do? How about $30 extra per month? No? Why?"
. I wouldn't be surprised if Google TV (would you miss our OVER priced PPV's and On Demand movies in exchange for built-in Google TV and access to Netflix and other such sites, and how much more per month would you be willing to pay for it?") is the point of the focus group or some other service or product not known to the public. But, we can hope that the purpose of your focus group is to find out what Dish thinks they are doing wrong and what it would you are looking for Dish to provide now and in the future to keep you as a customer, but I doubt it.
And, yeah, years ago when I went to a number of them, it was always CASH. Whoo-hoo! Have fun.