I have a WOZ, and I must say I've never ever put 9.000$ to a better use when it comes to adult toys. The build quality is remarkable, there is a lot of parts, graphic works, music works, toys. Compared to what new pinball cost in the 90's, factoring in the inflation and a less industrial approach due to lower volumes, I find it actually impressive that this game doesn't cost more.
I wouldn't say the same for all the recent pinballs, I still can't figure out why a TNA costs 7.500$, from a build perspective there isn't much on it, same goes with some Stern that still feel like toys to me, an issue I've always had with Stern machines actually.
15 years ago I bought a STTNG for 400 euros, and the guy actually begged me to give him an extra 100€ to leave with a World cup soccer, I could have scored a Twilight Zone the same day for 500, he was an operator in France at a time where arcade rooms where in serial closing mode and I was an idiot for not foreseeing the trend, but outside of these blessed few years, I still find pinball to be a very good buy.