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Even though it hasn't taken off yet in Australia, I think it is still a good choice for investors. I think it does give you more options when selling and there are collectors who like the extra security of knowing that the coin is problem free.
It actually has taken off in some series (pre-decimals, decimal singles), particularly in on-line markets where the need for third party grading is much greater (for obvious reasons). The percentage of sales that occur on-line will only increase over time which in turn will drag up demand for third party grading.