Now as to where the aliens are.. on a philosophical standpoint it might be that we are simply not that interesting to begin with. We are volatile, fearful of new things, greedy and vengeful and the simple revelation that there are Aliens might topple our entire worldwide system because of mass panic.
Alien life is rare. And when something is rare, the is no such thing as "not interesting".
Even if the aliens came from a region of space that is totally crowded with civilizations. We are in a region that is completely empty. That would make us special to aliens no matter what.