Fares are low because they gauge you for everything imaginable - including granting you check in luggage for your outbound journey but, on the return leg, informing you, at the airport, that your return sector has 0kg baggage allowance and fees are $40 per kg. I paid in advance for my check in but was 500g overweight and had to through out some of my clothes. My carry on was also 800g overweight and had to throw things from there. Customer service response on the scene: "we can upgrade you to business class for $600".
Also have an email chain running into triple figures from trying to sort out confusions and discrepancies since the day I bought my ticket.
Never again.