Only the top players chose to fold; no one's a fool. Knowing they can't win yet still insisting on continuing would only be more embarrassing.
They're the Gambling Kings, not some red-eyed gamblers. These people are very restrained and know the best time to walk away.
At this moment, Kawasaki Ichiro was quite conflicted. Qin Fang's hesitation indicated that he wasn't entirely confident, meaning his hand was not small, but not particularly strong either... at least certainly not a Queen of Spades.
But Qin Fang insisted on raising the stakes this much, not only to increase the pressure on Kawasaki Ichiro but also to test his nerve.
This, too, could be considered a form of psychological warfare.
In comparison, Kawasaki Ichiro was under significantly more pressure than Qin Fang. Faced with such a large bet, if he folded, he'd lose face badly.
However, blindly calling without clear direction wasn't a wise choice either, which is why he felt so entangled.