Well, about 2-3 years ago, In the Boston area, I saw one on craigslist for $1800, and another for $2700
I bought one from a flipper that was just off route for $2000 and knew of another from a local player/seller for $2200 I believe, that later changed his mind. This was all before Banzai was really on anyone's radar.
For some reason, I sold my Banzai Run for I believe $2100 to Barry in NJ, who then listed it and sold it for over $3,000, and I pretty much had a ''wtf did I just do'' moment after I did that.
Ever since that time, Banzai Run has shot through the roof and I do not see them for sale. I knew I had to have this game again, and found my current for $3400 that was brought to Allentown, pinfest, from the Allentown fs thread. There was also another listed in that thread by Paul Drabik for $3800, and that sold quick I believe.
So, they have become pricey and pop up from time to time in the 3's and 4's, but patience is the key.
and you're right, it is just one of those games. The theme, art, the dual spinners, captive ball, are all things I love, then throw in a vertical upper playfield that is fun to boot, it's just a great game. One of my all time favorites. Top 5 for me, and absolute ''king'' of the system 11's imho.