(IMHO if a survey needs to take these kinds of 'preventative' measure to ensure the quality fo the survey then i wouldn't consider them to be quality surveys in the first place, in fact, i think a real qualiy survey is one where it's so good that quality and integrity isn't even an issue to begin with and therefore such methods would be unnecessary but maybe my standards are too high)
I don't really follow your logic here. If a survey company took no preventative measures against fraud, it would be inundated with false responses and panelists in a matter of weeks, if not days. What makes a survey "good" for you (e.g. no chance of DQ) would make it terrible for the survey provider. And again, they write the checks. When you go to a restaurant you do not expect to be told how your steak should be cooked. You are paying for it and you get to choose. It's the same for surveys. They are ordering, and paying for, particular responses from particular demographics, and they don't want to pay for fraudulent responses.
i dont' disagree that DQs occur for those reasons, which is prefectly unsrestandble, it's however also possible, and more likely than one would conjecture, that there are actually surveys, like offers, that similarily 'credit' improperly or are expired but in a quite subtle method. this is hwere the "apaprent DQs" are rooted from.
basically, different ways of producing thes ame results.
It's possible that they are silently DQing without proper cause. But for most surveys, they have a large multinational firm behind them. Engaging in some kind of deceptive "occasionally don't credit some people" practices would open them up to huge liability (there are contracts in place, after all). I am more willing to admit that some traditional advertisers (not surveys) have engaged in practices like that, but when we detect it, we cut all ties.
On a side note, and please don't take this personally -- are you drunk? I've never seen you type like this before! I don't mind, just curious