one reason is that soon after they where released they had to pull all off the shelf because of the name,gravedigger.it conflicted with the monster truck who has the right to the name and all had to be pulled,i think only around a thousand sold.i have one and didn't understand it either until I started "digging" around for answers.but im like you guys too,its where these crazy's run the price up has a lot to do with it,because even regular quakerboy calls that are similier are bringing big money on ebay.