it all depends on which 'star' player your talking about.
someone in kobe's position should be at least taking a quarter of the shots, because there is no one else to do so.
wheras teams like the suns, spurs etc dont need their stars to take 20-30 shots a night, every night because their teams are stacked with players who can score and a team who has multiple scoring options will beat out a team with just one... however they can always go for that many shots in a given night if needed to do so
someone in kobe's position should be at least taking a quarter of the shots, because there is no one else to do so.
wheras teams like the suns, spurs etc dont need their stars to take 20-30 shots a night, every night because their teams are stacked with players who can score and a team who has multiple scoring options will beat out a team with just one... however they can always go for that many shots in a given night if needed to do so