It is true, that Kopi Luwak is one of the most expensive coffee bean. The process to achieve specialised coffee is long and they are risks of failing is very high. Thus, it makes it more expensive. Read ref below to understand more. There are some beans that are produced in Penang,Malayasia are very expensive but they taste out world(honestly). When enquired about it they say because it is freshly farmed and brewed. I believe that because around that cafe, it was all coffee and other farms.

History of Kopi Luwak: http://www.most-expensive.coffee/what-is-kopi-luwak-coffee/

Penang Coffee: http://www.thewaytocoffee.com/penang/