The problem is, it doesn't give them an idea of what ArmA is about. In the current Alpha Lite they have an Editor they don't know how to use. And they have the showcases, but that's it. To me, ArmA has always been about fighting large battles with friends or other people. And yes, of course they can experience the same graphical fidelity that is in the full game, but I don't think it's the graphics that make ArmA what it is.
The only thing I can tell from my experience is, that people become frustrated really fast when left alone in this game. This could be prevented by an Alpha Lite with multiplayer, because then new players could be introduced to the game by their friends.
---------- Post added at 16:43 ---------- Previous post was at 16:39 ----------
That would be a problem if they gave away free keys over weekends. But that's not what I'm talking about. Alpha Lite keys are given to friends and thus I don't think they would be the main source of cheating.