Advertising anyway they can

So tonight at midnight is when the new Assassin's Creed and Left 4 Dead are released. I personally went and pre-ordered Assassin's Creed 2 several weeks ago. Now when I pre-ordered the game they asked me for a phone number, which I thought at the time was merely to more easily find my order in their system. When yesterday I actually received an automated call inviting me to the store at round 10pm for from what it sounds like a release party. I have to say I was surprised and yet not surprised when I got this call, the reason being is that I should have known starting off that they would use my phone number for some form of advertisement, in this case the party. I don't plan on attending, but if I were to take a guess there are probably going to be some things there for people to spend their money on so that GameStop can make some money off of this release, and not just from the games themselves. So it shows ya that if you hand out any of your contact information they will 99.9% of the time send you some form of advertisement as small as it may be.