Earlier quoted context omitted.
EBay from China is now bye bye. Why would this change the be end of direct shipping from China? Currently (rounded off numbers) the cost of shipping a 2 lb (1 kg) package within the US is about $7, and the cost of shipping such a package from China to a US address is about $2. The obvious solution would be that the Chinese shipment ends up costing $9 (current Chinese rate of $2 to the US border, plus $7 standard US s…
Where are you getting those numbers from? My understanding is that there's a nominal fee for last-mile delivery the USPS charges mail from other countries, which is all (or the vast majority) that's being charged for Chinese shipments, as the Chinese side is subsidized completely (or almost so) for outgoing mail. I think the $2 you are quoting might be the treaty fee for delivering mail from other countries, which is…
The US rates are for small flat rate packages and envelopes on USPS.com. I didn't find an exact source for the China-to-US rate, so the $2 was the low end of a small number of articles about shipping rather than an exact quote. I may have misinterpreted, or converted using outdated exchange rates, or missed details about minimum quantities. As you say, there is subsidization involved, but I think this is about right for the amount charged to the shipper.