I was thinking the same thing. I wouldn't take too kindly to a company that made me give them an ID when they didn't need it just so they could grab my contact info. I'd see it as an invasion of privacy and would look to do business elsewhere.
You really should have people give you their contact info voluntarily, whether it's by asking for it or giving them something they see as a benefit that requires an email or mailing address for delivery.
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