If I buy an advert in a magazine / newspaper/ trade journal/  based in Oz I claim 10 % back.

If I sell through an Aussie based company I receive a 10% payment back through GST.

If I pay commission to an Aussie based B&M store I receive a benefit.

That is a positive effect on my cashflow until tax time as it reduces my amount payable on my BAS.

The only Australian based company I do not receive this benefit from is EBAY.COM.AU

My payments for services to Aussie Banks etc. attracts a GST payment for services provided.  

Why are Ebay so special ????????? do they actually contribute anything to Australia?

Anything I sell in Australia to australian customers is invoiced including GST. So because I sell through a swiss based company can I invoice all Ebay sales as GST exempt as they are GST exempt?  How does that add up???????