Most people have no idea what a politician (and their staff) does day to day, week to week, or what's involved in running an electrate office that serves 90 000 constituents or even what an electorate office does, let alone a minister or shadow minister, so they are simply not in a position or qualified to judge salary justifications.
Good luck to'em I say and putting aside policy view differences it's obvious most work very hard so probably deserve it
Mike