Nope. I once had some company ring me up trying to get me to book a photoshoot because my cousin had given them my number (amongst others).
He kept badgering about it saying how it was ok cos *my cousins name* has done it and enjoyed it. Then at the end he tried to get my credit card details for a £3 deposit, I explained to him that I wasn't going to give my credit card details to somebody who had phoned ME up, he acted all shocked and taken a back by this.
Anyway, I eventually got off the phone and went and googled the company and found horror stories. People who hadn't turned up and they'd taken hundreds out of their account as a fee for not turning up. Yikes.