I've had a few surveys where they asked me some demographics, then went on to ask opinions about products, got a fair bit of information out of me, then kicked me out. It seems to me they are becoming counter-productive being so trigger happy to kick people out. It just encourages us to try to tell them what we think they want to hear rather than our honest opinions. And they have our demographics in our profiles anyways-age, sex, race, etc, so why can't they just pre-qualify us?