I hope this continues for everyone's sake. But T.I.T and DTV is still very new. Do you need to 90 report? Will you pay tax if you stay over 180 days? Common sense tells me they will clamp down and short term courses for long term stays. They don't want you here because they like the colour of your hair, they want you here to get your money. If they can force you to spend more on courses every 180 days a year they will.
once you pay for the course no one cares if you go or not. However, you will need to continue purchasing the course to satisfy immigration officers.in the near future. 1 course will not get you a 5 year visa. T.I.T