The obvious lack of sales on eBay is due to a number of factors, not the least of which are higher prices than anywhere else due to the exorbitant fees being levied by Ebay on their sellers, including higher shipping costs because eBay have added fees to those as well.

Ebay has also received some pretty bad publicity during the last year or so and their reputation is completely shot at the moment, and I seriously doubt that they can recover in light of the fact that far more customer-oriented sites like AliExpress are now servicing Australian buyers at prices eBay can only dream of.

Also, eBay have clearly forgotten that sellers are also buyers, yet they've treated their sellers so appallingly over the last couple of years that sellers are leaving eBay in their droves and they're taking their money with them and spending it elsewhere.

There are additional reasons but that's enough to be going on with for now.