It all depends who you target, how you target, and who your targets refer.

I never would've done the Free iPod thing that was popular a couple months back, but a trusted friend of mine got me started on it - I ended up getting my iPod and was pretty happy about it. Had he not talked to me about it, I never would've considered it, and I don't do any of these others that popup around the place either (Read: free flat screen, digital camera, vacation, etc...) as I just flat out don't trust 'em, and the time can be better spent elsewhere.

It all boils down to who you target, how you target, and who your targets try and refer.