go back and read the previous posts.

I will type it out slowly for you, well maybe read it slowly:

eBay do not charge GST on domestic postage.  They do charge sellers GST on the fees they pay, including the fees on postage.  When a member buys from overseas, they do charge GST on the postage paid on items under the GST on Low Value Imports legislation.

One last thing, do you know Stanley?  He should be along soon to leave a post, him or one of his friends!