Just for jollies, I took the poll with a completely fictitious email address.
They took it just fine.
Ergo, this simple lack of due validation process invalidates any conclusion they may reach and/or publish. Anyone (perhaps a rabid member, or perhaps a solicited/compensated group) could take the poll thousands of times. A simple program would generate millions.
And I think it was simply yet another of the all-to-frequent solicitations for money. When I joined, I was not prepared for it to have the same effect as having my email address stolen by a spammer.
They have also tried sending unsolicited products and then badgering you to pay for them. Of course, under USPS regulations, you have no obligation to respond in any way (including returning the item). Since it was a CD or DVD, the "value" was essentially pennies for the pressed media and non-profit postage. Essentially Zero. Probably cost more for the follow-up dunning than it did to send it initially. This is not the action of an ethical organization!
They are forever sending stuff to "fill out' or "enter" whose sole purpose appears to be fund raising. They are worse than AARP.