Originally Posted by
SoCalPLT
Start settling your hotel bills with Aussie dollar coins. They are legal tender and imagine the slow down at check out if all their guests start paying in coins. Make it as unwelcome to add the surcharge as you can. If they start losing money because of the surcharge they will drop it. Starwood properties will start the surcharge effective Jan. 9, 2012

In fact, amounts of coins, in varying combinations, but any over $10.00, are not considered legal tender in Australia, although a merchant may decide to accept them.
Paying with large numbers of coins, which is generally done out of spite, is not permitted in many situations. It's a bit of a childish protest.