Re: AUS Medicare and US Medicare
Not following your line of argument. The US equivalently named card is easy to guess if you have the SSN, which is a apparently cheap. Therefore people must be crazy for paying 30 bucks for it? They aren't buying a US card, so the fact that you can get a US version cheaply is irrelevant. From your subject line you seem to know this.
When you apply for a loan or a passport or a birth certificate, phone contract, lease, etc, they request that you provide a copy of some quantity of documents from list 1, some quantity from list 2 and so on. A Medicare card goes a long way towards passing that test.