BG7RRX The main point is that you can send regular mail directly to overseas recipients, but you can't expect overseas ham radio operators to receive your mail via regular post.
In particular, postage costs are relatively high in many countries. The lower cost in China is due to preferential rates offered by Universal Postal Union (UPU) to developing countries.
I still hope that CRAC Buro can be improved so that it's more convenient for everyone. Even if we have to launch a fundraising campaign, I believe that as long as the service is good, people will be willing to contribute.