Enner, I couldn't agree with you more. Chances are if you play that much, you probably like it enough to warrant a purchase.
One thing, too, is that the number of times you have left to play the demo appears below the logo on the 3D screen. Also, I think that if the demos don't have to be reset, you can potentially play the same demo without leaving the game indefinitely and have it still count as one play. I'm still testing this stuff out though, and will let everyone know if this isn't the case.