“Why would they want to stop sales?”
Simply because their entire idea has been to make some profit on the hardware sale, and then much more profit on the cut of the usage revenues.
Unless they have abandoned plans to make a deal for a cut of usage revenues in China, EVERY unlocked handset is one that they have lost that portion of profit forever.
“It’s a nice problem to have.” IF your goal is sales volume at the expense of higher ongoing revenue.
Someone on another thread asked about how it would be used in China - Here’s a site that lists a Chinese language pack for an unlocked and jailbroken phone.
http://www.pqdvd.com/iphonetheme.html
Looks like people just doing the work that apple programmers won’t do ...