Yeah, yeah, I know there are exceptions but for the vast majority this is simply advertising - marketing 101 as previously stated. For us guys this is like dangling the bait in front of our noses. (And I'm just as likely to bite the hook as the next guy.)
But, methinks it's going a bit too far when you get that cutesy txt msg saying "Hi sweetie. How u been. Missin u." and you later find out she sent a broadcast message to everybody in her phone address book. And even then your brain reminds you how good she smelled the last time.
Unless of course it's from Cathy ....