How can we say definitively (or with any certainty) that there are relatively advanced life forms everywhere, such that they are a dime a dozen? How do we know

How can we say definitively (or with any certainty) that there are relatively advanced life forms everywhere, such that they are a dime a dozen? How do we know that interstellar travelers wouldn't find us rare and interesting? Curiosity more than anything is what drives our need to know. I think that's what would drive such visitors. In fact, because they would be more technologically advanced and would likely have solved resource problems, etc., they would naturally have time to spend exploring and answering questions. Finally, we can assume such explorers are more advanced than we, but not necessarily by orders of magnitude. I think people have a tendancy to attribute god-like qualities to them because they have solved some problems that we have not. But, the idea of splitting an atom was outlandish until a handful of dudes, inspired by another dude's theory did it in a relatively short span. Similar with other breakthroughs. At any given time, a single discovery can advance our knowledge far beyond what we thought possible, and even moreso with the accelerating pace of technology. And, BTW, many of our own "resource problems" are completely solvable and should not exist. For instance, we have an obesity problem in the U.S. while millions starve elsewhere (and in the U.S.). It seems that our biggest obstacles are a product of human nature. If anything, an alien species' appearance might be indicative of an advancement in philosophy or organizational behavior (ex. hive mentality vs. individual) moreso than a far superior intelligence.