People are meant to grow.
Things that Feng Biao didn't know before, he knows now, and likewise for principles he didn't understand, he grasps some of it — not much, but indeed some.
For instance, the trade of military arms isn't something that you can simply buy if you want to buy, or sell if you want to sell.
Some weapons, no matter how much money you offer, cannot be sold by others, like Russia's Baiyang Missile, the Tu-160 Bomber, and also the Typhoon-class Nuclear Submarine. Even when Russia was impoverished, they didn't sell these items.
These strategic weapons are the cornerstone of a superpower; if they were to proliferate worldwide, could the great powers still be considered great?
In the same vein, the United States hasn't sold the F-22 Fighter to date, and it's even less likely they'd sell the B-2 Bomber, not to mention nuclear submarines are out of the question.