Yeah, it's an interesting promotion. I kind of like the idea of it, though I don't think I'll be participating in it this time. As little as $3 is, this month's budget is already stressed out enough as it is without spending money on what is essentially gambling for a good game.
There's a part of it that seems like a capsule machine. Stick in a quarter, get a capsule with a toy! Except in this case it's a black box. You don't get to see your potential prizes. If they listed all the possible results, I might be able to make a more informed decision as to whether or not to play the game.
But for now it seems like throwing $3 into a black hole and hoping something good comes out.