On the other hand I agree our natural resources are likely worthless. I always laugh at that scientology movie, Battlefield Earth, where the aliens invade, then inslave humans to dig in Earth's gold mines with pickaxes. Maybe the most troublesome possible way you could acquire gold as a spacefairing race.
As a hobby project I'm making a video game about aliens looting museums and zoos for items of cultural and biological value. Mostly because I find the idea of little green men busting up the Louvre then blasting off to be very funny. The zoo angle is a little nonsensical if you consider how much DNA is shared, but obviously scooping up pondscum is a less interesting scenario.
Do we reroute highways to avoid anthills?
Who's to say that there doesn't exist a cosmic version of Greenpeace that has been actively pamphleteering some galactic government into not star-lasering(1) our little green and blue anthill to a husk for its latest celestial mega-infrastructure project?