90% of my github stars are projects which I skimmed over and thought looked cool and I might download one day.
Ditto. I use them to (hopefully) send good vibes the the creator / maintainer - you never know, they may need the tiny endorphin hit!
Which means it is a project you should some basic level of interest in. A download might be a dependency of a dependency of a dependency you don't really care about and actually would like to get rid of ...