A ScubaBoard Staff Message...
I've also been asked to remind you to stay on topic: Cave etiquette and Training. Thank you!
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A ScubaBoard Staff Message...
Actually, by your reasoning you can potentially do more harm than good. Even though well-intentioned. Samples don't necessarily need to be large (depends on the distribution of the population) but they have to be random. This is one of the cases where common sense reasoning -- pieces of information gathered may not help but cannot hurt -- can be wrong. What karstdvr points out should be taken to heart.
If you are really interested in learning about the opinion of NACD members (by "really" I don't question your sincerity but whether you're prepared to put hard resources behind it), then something like the following might help: among the current membership, randomly generate x samples/members. Then provide a questionnaire (must be brief) to fill out, anonymized. Provide an incentive: free 6-month (or a year) membership. You will still only get a partial response but the information contained will be meaningful. As opposed to the repeated kibitzing by the same folks on this board. I'm a NACD member and the freebie won't entice me to spend a few minutes to send in a questionnaire (I doubt for many cave divers membership fee is a significant financial factor) but the perceived seriousness of the effort might.
This thread is so long that I have to recheck what it was about, but I do applaud the overall effort.