Who says that's why it was created. That's just what the old man and his pals are doing with it. The real purpose behind it, the aliens and vamps is probably something different.
We just know that his wife talked gibberish and it turned out to be blueprints. He built the stuff and deployed it. We don't know why and how she came up with that stuff, if the old man just put balls everywhere or if he put the people in them too, where the aliens come from etc.
Most likely he has no idea about the real purpose of it. He just saw what became of it and thought "hey, me and my pals could bet on this shit".
"For Feanor was made the mightiest in all parts of body and mind, in valour, in endurance, in beauty, in understanding, in skill, in strength and subtlety alike, of all the Children of Illuvatar, and a bright flame was in him"