This would suggest that the aliens are not truly part of an advanced civilisation, but they are intead pretty dumb. They have a small but limited range of advanced technologies, good enough to get them here, but not adaptable enough to be useful to human society. They can't give us limited energy, clean water, cure our pandemics, or give us long life.
I've suggested this idea before on this forum; the aliens are stupid - they are post-intelligent, they rely on the (presumably limited) AI in their spaceships to keep them alive, but they can't make any useful decisions (like initiating contact), they don't know how to turn the lights off on the outside of their ships ( which means they are visible at night), and they can't help crashing their ships in places like Siberia and New Mexico.
It's not really worth trying to make contact with post-intelligent aliens - they evolved into the Idiocracy stage long ago.