Another good poiont raised by Herr Doktor, but in reality the business world does far more devious things than compile lists to send out greeting cards, although they do that too. Ever used a Safeway club card or similar product at umpteen grocery/big box stores? Because they study and track your purchasing habits, looking for a way to manipulate you to buy more. Dozens of corporations compile databases containing very personal information which is bought and sold, again in the name of business and used for profit, all done legally, although illegal transactions are exposed now and then.
But no, Herr Doktor is right, compiling a list to send out greeting cards to a target market of voters is just crazy.