Why would they waste resources on dealing with us, when everything you could ever want to mine is more easily accessible elsewhere in the solar system?

Interstellar travel requires insane resources. Making a trip like that would mean that whoever is travelling, isn't short on neither resources nor power generation capability.
It's unlikely that a species willing to commit such effort would have anything but a scientific interest in us.
I mean, they would probably be as varied and curious as us.

Unless they're dogmatic fanatics, want to hunt us for sport, or need more slaves for their pleasure/death cult. Then we're screwed.