That is entirely possible however there could be many many other reasons we haven't seen other intelligent life.
Like the fact that maybe they're so smart they decided to stay Away From Us!!!!
Think about. Even if our closest Star is habited by intelligent life. At this point our broadcast waves, TV, Radio, etc etc, from 40 years ago are Just Not Reaching them. So what are they seeing right now? B Movies from the 50's and 60's, other Horror movies, etc etc. Now Imagine our culture is so "alien" to them that they don't know what to make out of what they are seeing?
Two Aliens talking to each other: Alien 1 = Quaznort. Alien 2 = Gragmits
Quaznort: "Hello Gragmits, what are we doing today? Studdying more signals from that backwater little world we found?
Gragmits: "Yes oh wise Quaznort. For some reason these Humans make a broadcast every time something happens to one of them or even when they are in the middle of wars or invasions."
Quaznort: "And what have we learned today? Is it wise to start sending the invasion fleets?"
Gragmits: Oh NO most noble Quaznort, we must in fact NEVER invade this Earth place. I believe we should STAY AWAY from these Humans until we have no choice but to communicate with them if they find us and come here."
Quaznort: "Why is this, Gragmits?"
Gragmits: "These Humans, even though they are fragile as a solitary being, together they are powerful and almost undefeatable. Also, some among them have what they call "Super Powers", like this "Super-Man" for instance. Look at this footage. These other humans bow to him because nothing they have on the planet can stop him. Though because these Humans still cling to quaint ideas like Right and Wrong and Good and Evil this Super-Man has decided to protect them instead of just conquer them. Other species have tried invasions only to be killed by the toxic environment and some powerful biological weapon the humans call a "cold". Look at this footage called "War of the Worlds". The neighboring Martians tried to invade Earth multiple times and were beaten back every time. When we scan for life on the planet Mars all we see is a barren wasteland. This leads us to conclude that not only did the Humans destroy the martians but they then somehow wiped out all life on the planet Mars to guard against future invasions."
Quaznort: "That settles it then. Inform the other intelligent life forms in our sector of the Galaxy. NO CONTACT what-so-ever is to be made with these Humans. They are far too violent and militant. They would only try to destroy us as they seem to do to any other foreign life that goes near their planet. Interstellar quarantine of Earth is NOW in EFFECT."
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So, if Alien life is out there and they have been studying us through our broadcasts they could have decided long ago to leave us alone and never come say "hi". They might not understand that most of the broadcasts they are seeing are what we call "Entertainment". They might think it's real. How do we know? We don't.
