Also, imagine I was doing the voting coin giveaway. What if I decided I don't like you or your address? You simply would not get any voting coins.
I don't like centralization.
This has to be on an non moderated thread and if there is one legit adress without an transaction from you we would nullify your whole thread. After a while you would have to publish priv.keys and we go thru the tread. Everyone that didn't get a coin would scream andit's trivial to check if there are more outgoing than adresses in the thread.
BTW: CC is esential for any kind of voting via adresses and not donations.
EDIT: After publishing privkeys new txt are of course non valid for voting.