ABN numbers on invoices provided by suppliers.

Can someone at eBay explain to me how an Australian company selling on eBay doesn't have to supply an ABN number on their invoice. It becomes frustrating having to chase up something that should be a part of doing business these days. Please fix the problem, love using eBay to purchase my products but I waste a heap of time chasing ABN, time I dont have. Thank you Andrew. 

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Plus a lot of the items you have bought are from sellers registered in China