Everybody had their own interests and their ideas of what they are willing to pay. If people have extra money they are free to spend it on knives, cars, boats, beer, whatever. Some people spend insane amounts of fishing boats, motorcycles, golf, ski trips, whatever. An expensive knife is a drop in the bucket compared to a modest bass boat.
If it bothers you to tell people at work what your knives cost then avoid that part of the conversation.
If it bothers you to tell people at work what your knives cost then avoid that part of the conversation.