Let's postulate that some alien race has discovered a scientific principle that we have yet to find (let's face it we haven't been around that long yet compared to the dinosaurs). They discover a way to travel long distances without taking any time to get where they are going.
Are they going to start talking to a planetful of primitives which will mean spending ages to learn communication skills, languages etc., or are they going to go sight-seeing (whatever their version of sight-seeing is) instead?
They have millions of planets to visit so they will spend time on the interesting but safe ones. They may gett round to coming back here later once they've checked that they haven't something more important to do.
Perhaps they are off to save the Galaxy from collapsing into a giat black hole or something similar and are just checking us out for ideas!