The Chinese government heavily subsidises shipping from China. The cost to the sellers still enables them to profit while flooding Australia with their poorly-made items.

I’m not in favour of buying such stuff and I wish other Australians would be more discriminating rather than going for the cheapest thing in the clear expectation of an amazing bargain.

The issue is much bigger than your question about “shiping” charges. If you are looking at such items as a comparison, albeit while commenting on the postage component, I suspect that the items you want to sell are similar in nature and quality, and I can only cry out, “No… no more cheap t-shirts probably fabricated with slave labour and dyed/treated with cheap carcinogenic dyes or softeners…”