Why the best products and the worst both made in China ???

Last Summer I bought a wood lock for 85 bucks and it work well. It seems China had the best and worst product, but need to choose very carefully. The 140 millions population make either very poor population and very rich one are both huge and need supply. You can try “Osoel Locks” if you need passcode door lock.

What I feel is, the worst product in China is feeding local poor people and meanwhile export to Africa. And some very best product selling to rich domestic Chinese and meanwhile export to developed countries like USA or EU.