Heh, to be honest I'm one of those who think J-10C isn't truly nessesary for PAF. I didn't claim anything, since I wasn't active here at the time. My thought was, is having an aircraft with the capabilty of, at most, one and a half JF-17BLK3, worth all the trouble of inducting something entirely new? I still think the J-10C purchase was either very forward looking(In my opinion the JF-17 platform is near its limits, and PAF may benefit from further developments of J-10 by PLA) or political in nature. Anyway, not here to debate this.
In my opinion there are two main reasons people don't think China sells their top of the line stuff:
1, The technology is sensitive. US don't sell their F-22, B-1B or B-2. They only sell F-35 to a handful of allies they trust. Whenever a F-35 is at risk of falling into untrusted hands(I.E. that crash in South China Sea from a few weeks ago), they get extremely nervous. I don't see China being much different. The examples you've listed(European stuff, I presume Rafale, EF2000, Gripen) are all 4th gen. Of course it's less sensitive, it's older tech. China in the past have done the same, they sold their best fighter at the time - the J-7. But J-7 is nowhere near the cutting edge even then.
2, Chinese aircraft manufacturers are all state owned. Their priority is to satisfy the demand of the PLA, not chasing profit. The PLA generates such a huge amount of demand that they never had to worry about finding buyers. Even if the manufacturers want to sell them abroad, they still have to go through all the red tape from the central government. When it comes to security, China is very insecure (heh). You can tell by them barely releasing any training footage or blurring cockpit footage of 15 year old aircrafts for fear of leaking sensitive information. So marketing and selling to non-Chinese customers was never of much interest to Chinese aircraft manufacturers.
