The fat profit margins Airbnb hosts can reap on their properties are proving more attractive than the money Aussie investors can make as traditional landlords, a new study has found. A new global index comparing how long it took to make back the value of a property via Airbnb versus the conventional rental market named Sydney, Perth and Melbourne in the top 50 global cities where owners could recoup costs quicker via the sharing platform. The data, from London-based online es