Hunting truffles now a days is likely becoming a trend not just because of the the variety of culinary use of it but it also comes with a very high price tag. A lot of people would pay extra just to get a hold of a very delicious, delicate, and hard to find truffles. On the question how expensive truffles really are, you can read and watch this article about truffle hunting to learn more here https://www.trufflemagic.com/blog/magic-truffle-hunting/