£80k or £80b is just a question of degree. The principle that those having attracted more wealth to them, way above covering their needs, (whilst other citizens who also work hard but get hardly a fraction of that) should pay more into the pot, is a reasonable one.
Folk may not think they have exploited others but accumulating excess compared to the norm can't be done without asking for more than one could, or even should, for their product or service. It matters little if one does it for oneself or have an employer who does and passes on a sizeable portion to those they employ.
Ultimately this is simply about who should pay what portion into the public purse. The more leisure/luxury wealth you attract as a member of the country then surely the greater percentage of that you should gratefully pay; whereas the closer to just covering your needs that you are, the smaller percentage you should be expected to contribute.