Because if we meet them, it's because they got here thus they're a lot more technologically advanced than we are? (Though there's a fun short story from way ba

Because if we meet them, it's because they got here thus they're a lot more technologically advanced than we are? (Though there's a fun short story from way back that ends with aliens who have FTL travel wanting to buy our high-reliability computing/robotics tech, because they've never developed any for themselves :-)