Medibank Private chief executive David Koczkar has a meerkat in his bonnet.Lobbing reporting season’s first big grenade, Koczkar accused insurance aggregators, which most of us know as the online comparison sites such as Compare The Market and its sister brand iSelect, of doing little more than encouraging churn, driving up premiums and adding $200 million in costs to a sector where every dollar is supposed to be closely scrutinised.Subscribe to gift this articleGift 5 articles to anyone you choose each month when you subscribe.Subscribe nowAlready a subscriber? Fetching latest articles