GST is 10%. So why does eBay add 20% ?

Goods brought into Australia, purchased from a registered business attract a 10% GST charge.

 

But eBay adds "Import Charges" at 20% of the purchase price, even from private sellers. Why is the fee double the tax rate? And why is it applied to sellers who are not a registered business?

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The GST also applies to the shipping costs on top of the purchase price.  Note when you are buying via ebay, the GST applies to all

international purchases,  private/business does not matter, as ebay is required to collect it, not the individual seller.