Personally I use stars in two ways: 1) It's interesting and I want to keep track of it for possible future use and 2) It's a fantastic idea and kudos to you even if I'll never use it.

As a side note it's kind of disheartening that everytime there is a metric related to popularity there would be some among us that will try to game it for profit, basically to manipulate our natural bias.

As a side note it's always a bit sad how the parasocial nature of the modern web make us like machine interfacing via simple widgets, becoming mechanical robot ourselves rationalising IO via simple metrics kind of forgetting that the map is never the territory.