not willing to pay a big markup...sometimes people change their mind, have financial reasons, etc.
Change their mind after 2/3/4 years waiting? Are you kidding?
Financial reasons can be, but even in that case, they can simply cancel and get money back from tesla (4.000 euros!)
How much is for you a "small markup"... BTW don't dream, I'm not going to give you my model S reservation ;-) (Maybe 1M I can do it lol)