I usually fill those out with friend's contact info, just to be helpful of course.
Honestly, what friend wouldn't want a timeshare investment seminar over the phone at supper time?
My daughter filled out one of those when underage and they called her, didn't realize the implications of calling someone underage and believe me the SHTF. They neglected to check her age or ask it on the first call and the company got in deep trouble.
Why use a 50 pound bomb when a 500 pound bomb will do?