I assume your referrals to "koreans" and "they" here are NOT CATEGORICAL.
As pointed out in the last couple of posts, it can be useful to get a grip on cultural norms and influences on approaches to business. While there is a fine line between appreciating different cultural perspectives on the one hand, and engaging in stereotypes on the other hand, there is value in understanding that people from different cultures do not always see things the same way.
These types of "categorical, but not always individually applicable" understandings can sometimes provide insight into problems that develop in doing business across cultural borders.
On the subject of bargaining behavior alone, the marketplace assumptions and behavior of, say, an American suburbanite, who is used to going to the store, reading the price tag, and paying that price, can be wildly different from people who have not grown up in that bubble.
