The way I see it you can play pretty much any arcade (video game) on a computer and it is close to the real thing. But with a pinball machine only a pinball machine is "the real thing". And most are so different than each other it keeps you wanting more of them.
When I bought my first machine the guy warned me the "these things are like potato chips you will never stop with just one". Three years and 150 machines later I would have to say he was correct!
We keep buying older cheaper SS machines, fixing them, enjoying them, and then selling them to buy something else we like even better. Really bad habit - but I guess it could be worse. At least or collection maxes out at about 30 machines due to space issues so everything over about 30 machines has to go to keep getting other neat machines we keep finding.