The same thing is happening here in Australia. Jetstar advertised flights from Sydney to Avalon for the Avalon Airshow for something like $30 per person (That’s cheap for Australia) and then they quietly mention that there are taxes, fees and surcharges of $40! I think that the Australian govt should bring in laws for including taxes in tickets as it catches alot of people out.
Just my two cents worth.

Cheers,
Paul