What does the Popularity Star Mean?

Here's what the different stars mean:

Yellow Star (1st star) = 10 to 49 purchases made
Red Star (1st star) = 50 to 100 purchases made
Green Star (1st star) =  100  to 200  purchases made
Purple Shooting Star (1st star) = 200+ purchases made

The more purchases made the more POPULAR this item is to the world.