I don't think donations have any relation with being a good member if they are getting something back for it, at all.
Trolls don't spend money on the site. You don't spend money on something you don't care about. So anyone that is a donator cares about the well being of the site.
That doesn't mean a donator is automatically better than someone who doesn't donate. You don't have to donate to be a good user. But the likelihood of a donator being a problematic user is much lower than a non-donator.