I just don't understand the economic logic. A Beatles license, especially considering the target group of people who buy new pinball machines (35-60 yo with above average income) is the most coveted license you can ever get. ACDC, Iron Maiden, Aerosmith are all very nice but the Beatles have a gigantic lasting global appeal. No other music group or artist in history even comes close. Michael Jackson, maybe.
Comparisons with Beatles themed video games really don't make any sense. They're played by a much younger target group, completely different demographics and culture.
A well executed machine could have sold for years in much much higher volume that the other Stern music pins. If I was Stern, I really would not have cared if the license was $500 or $1000 per machine higher. It could have been destined for Addams Family sales figures.
/edit I would seriously not be surprised if Stern is taking the piss out of us and does in the end come up with a proper pinball machine instead of what's being shown now.