Bob,
I know I cannot change your mind and nor do I wish to do so. But... Two years ago I was given a Sam's Club membership as a gift. When I went to the warehouse and presented the gift certificate, they took my mug shot and asked me to provide my e-mail address and phone number. I did not think that information was necessary and told them I would prefer not to provide the information. The programmed young lady that was processing my membership rattled off a list of reasons why it would be of benefit to me to provide the information. I ended up giving them my infrequently used yahoo e-mail address (no way I was going to give them my business e-mail address) and the phone number 867-5309 (those of you that grew up in the '80's will understand why).
So, one day I got an e-mail at my yahoo address from Sam's Club. Probably SPAM, I figured. Wrong. They sent me an e-mail to let me know that the toy train set I had purchased for my little niece had been recalled by the manufacturer and they provided details on how to return the set AND get my money back.
Did they also sell my yahoo address and bogus phone number to someone? Yeah, probably. Would I have found out about the recall and been able to get that train set away from my niece without the notice? No.