[dogma1138]

We've been transmitting for less than 150 years, our species has been around for what is now believed to be 250k or so years, life on earth is about 4 bln years old.

Even if we continue to survive as a technological species for another 1000-5000 years and not push ourselves to extinction even if we go 10,000 years it's still a spec on the timeline of our galaxy not to mention our universe.

It's very likely that life is very common, technological species might also be common but this is on universal time scales it's also pretty likely that because species and entire planets go extinct all the time that the they simply do not overlap on universal time scales.