It's mostly generational... If you were born after 1970, you probably didn't experience the golden age of EM pinball machines. People want to relive their youth, so most people in the hobby want machines from the 1980s and 1990s. And since many machines from the 2000s/2010s were basically the same as the machines from the 1990s, people want all eras of DMD machines. EM pinball machine disappeared between 1978 (when SS machines took over) and 1996 (when the Internet became popular linking collectors), and many people just forgot about EM machines during that time frame. If you were an EM collector between 1978 and 1996, you were isolated locally with very few resources other than a few arcade/vending publications. This 18 years of isolation did take its toll on future EM collectability and pricing. Overall, there's just not enough demand for EM pinball machines for them to garner the big money... Back in the early 1980s, I was buying project EM pinball machine (some working) for between $100-$300. In 2018, I'm buying project EM pinball machines for between $100-$300...