I have talked to the seller via email various times and my buddy Jim (JT Amusements) has seen these machines in person. It is my understanding owner passed away and either his wife (or other family) is trying to sell off his machines. I am not 100% sure but either everything he owned - or at least almost everything he owned - was classic Bally EM machines.
Seller seems like a very nice person that is just looking for "fair" prices for these machines. Again - if I am understanding things correct - Jim appraised them for the current seller. I don't know that he actually told them what to list them for I think he just gave them a value range on each as far as I know. Anyway - if anyone is seriously interested I am sure Jim would be more than happy to tell you more of the story.