There's another way to look at this.
Back in 2011, you could pay a 5,000 deposit for a Model S which only existed on paper, or a 40,000 deposit for a Signature Model S which (if it ever came into existence) you would see a few weeks earlier than an ordinary Model S. In both cases no escrow, no bank guarantee.
I somewhat feel sorry for those who took the "Signature" route. They were fully risking all that money anyway, so they could just as well have put the difference of 35,000 into Tesla shares (which were trading around 20 USD at the time). 35,000 / 20 * 360 = 630,000. That's 595,000 profit, i.e. two Model X or S for free for husband and wife and six Model 3's to give away to the kids and their cousins

.
(but I do admit I always love seeing a Signature S, in that beautiful dark red)