WindWarrior said..
Once you start adding food, entertainment, drinks, standard luggage limits (pretty much everything that all other carriers offer as standard) the price starts creeping up and the original super cheap fare isn't that cheap after all.
I actually once ordered some hot food on a Virgin flight to Perth where the ticket didn't include a meal service. To my surprise is was miles better then that slop they serve up in Qantas economy.
I think at the moment Qantas is the carrier of choice if you fly domestically with surf / windsurf boards. Personally I am surprised none of the airlines have introduced a flat rate for sports equipment as it exists in Europe... eg $50 for a bike, $100 for surf board. It would stop this guessing game when you buy a ticket.
Internationally the story is completely different. Tiger Airways for example charges $50 flat rate on international routes for a sports bag ex Singapore or ex Perth. Qantas, Singapore Airlines will hit you up per kilo. Just bought pre-paid excess on an international Qantas flight... $2520 for 120 kg one way. Ouch...