Gullible

This ad is going around in the newspapers these days:
Vitamine
Well, all I could do was roll on the floor laughing my ass off (and that, only because of one word: immediate. So follow-up questions are not possible). What would you expect if you’d send an SMS with just your gender and age ? I guess the responding SMS would be something like “We were just measuring the gullibility of the Dutch population. YOU DUMBASS, HOW CAN WE DECIDE IF YOU GET ENOUGH VITAMINS IN YOUR SYSTEM WITH JUST THESE TWO LOUSY PIECES OF INFORMATION !!! Oh and THANK YOU FOR SENDING THE SMS, WE REALLY LIKE ALL THE MONEY WE’VE EARNED ON YOU”.
Of course, they get more info, sometimes your phone number, but that could be useless, as a prepaid would be virtually untraceable. With subscriptions, you can trace the owner, and using a linked database, like the one of the Airmiles, you could get some extra info. Then again, linking databases like that is still illegal. So, you have a better (valid) explanation, that doesn’t always answer YES YOU NEED EXTRA VITAMINS ?