The average entrance fee to a Tokyo club is 3000 - 4000 yen (sometimes as high as 6500, depending whats going on there) , can beer = 700 / 800yen , cocktails minimum 800yen
entrance(3500~) +beers(maybe 8 6400~) + food afterwards (1000+~) + train fare(500~) or taxi (2000~+) = 12900yen = 173.80AUD
as beerbaron said a good meal in tokyo is about 8000yen (id even say a little more depending where and what you order), you would probably eat out every night.
1 club + dinners alone = 600 dollars (for a 4 night stay)
then add, public transport / taxi rides + breakfast + lunch + vending machine drinks anything else you want to buy
at the moment 700AUD = 51,000yen
for a good time in Tokyo, including clubs , shopping and food. For 2 nights 6-700AUD just might be enough, but for 4 nights no way.