...perhaps someone with deep pockets like certain keynote stores would order certain models to then have in stock. As such, use a 'flipper' to sell these rare watches to people who "must have it now" and not desiring waiting months for the timepiece to be produced. Naturally the "must have it now" person may also pay far over retail, or worse still a 'flipper' in need of fast cash places the timepiece at auction. If too many flippers do this, it may give the appearance of 'cheapening' the brand.
Besdies, odds are the demand outstrips the ability to product such complicated pieces in (relatively) high numbers and thus Patek may feel it is best to produce these timepieces for true enthusiasts than for those who only want to 'make a fast buck' by flipping them. i applaud Patek for the application process as am sure it is easy for them to detect the difference between a longtime enthusiasts and...