This is not directed at the OP, just observations on the market.
Actually, not everybody does know what is going on with DP, in fact, only pre order buyers, and a very small percentage of pinball owners and enthusiasts.
For a person such as myself who constantly evaluates the market, there are indications as I see more and more people who want to sell machine "slots" for games that do not exist, even at reduced rates. Even if potential owners like the real stock market, this is not an industry that is attenuable for such actions in the long term. A person outside this small niche hobby, would think a person is insane.
Essentially, it is like a job recruiter "shark" (pinball manufacturer), a person is selling an idea to "buyer-in" (pinball enthusiast), and profiting (salary %) from convincing a person it was a good idea for your future on a job said person knows nothing about (due to lack of experience and overly enthusiastic).
Now, a same said person is trying to pass this same decision of judgement to another (who has to be an even less experienced and knowledgeable, but overly enthusiastic buyer banking on not knowing what might happen), but does not have an market experience or even any real form of justification to try and convince the next person it was a good idea in the first place, in order to get his money (or part of his money) back.
This is not even a timeshare, as at least you get something for your money.
A person new to this hobby, can see if they were looking into this fishbowl, they might be confused, even baffled at this for sale post.
It makes pinball manufacturers look like con artists, and pinball enthusiasts look like fools.
A terrible combination for the market overall.
Wealthy gamblers don't buy pinball machines, and gamble in much more lucrative pursuits that actually provide substantial gains.
People do not get rich selling pinball machines, ask any dealer who still remains after 30 years or more, which are only a few.
In essence, "table flipping" is starting to come to a close, as NIB games (except specific titles) sales slow down, for many new buyers.
It really did not last that long to begin with overall, just a trend of attack from the old "box and run" days that started all the way back in the 1980s.
There will always be exceptions to the 1000-1500 hard core collectors out there around the world either with limited editions, or special "super deluxe" games. Even the lastest MG flop, is seizing up faster than I expected, as the game just is not getting resold for 3-4X its original cost, yet some believed immediately it could sell readily and repeatedly for over $30K.
OP, I do hope you get your game, and perhaps learned from this experience whatever the outcome.
Pinball is not about the value of title, but the premise of entertainment.
Those people (not necessarily you), need to move on, before they have to learn this lesson themselves.
History has been repeated quite a few times in the past 6 years, little learned by some, but has a few more new companies to fail before it is over for both new buyers and the manufacturers.
The year of 2017 will be a time of less manufacturers, not more.