Medibank Private says commissions being charged by insurance comparison sites through opaque brokerage arrangements are driving up premiums by as much as 30 per cent without benefiting consumers.Loading... or Subscribe to save articleEmailLinkedInTwitterFacebookSubscribe to gift this articleGift 5 articles to anyone you choose each month when you subscribe.Subscribe nowAlready a subscriber? License articleRead MoreEarnings seasonMedibank PrivateHealth insuranceHospitalsMark ButlerDavid KoczkarHealthcare