Welcome back to The Hill I’ll Die On, our Friday mini-series inside The Property Couch. Each week, a member of the Couch Crew steps up to share a bold money or property opinion they’re willing to stand behind — and unpack the behind-the-scenes truths most people think… but rarely say out loud. This week’s guest is Luke Oxenham, one of Australia’s leading mortgage brokers. Luke’s hill? Don’t take financial advice from Instagram. From “pay off your home loan in sev...