I'm sure it's a lot more complicated than that. How did they get the store-within-a-store at Selfridge's, or the multiple placements with Vogue, or the display at Colette's? I'm sure Ahrendts' fashion connections played a big part in all of that. One part of it is emphasizing online sales, but that's not their entire retail strategy.
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Part of satisfying customers is not setting up unrealistic expectations. Apple has been a victim of its own success at times. No matter how many iPhones they produce ahead of time, it seems they can never produce enough to meet the initial wave. With the Watch, there are many unknowns. As you mentioned in another post, they don't know which band or body choices will be the most popular, at least not yet.
They don't want to be "stuck" with 5 million aluminum Watches if the Stainless Steel proves to be the most popular, or vice versa. The same with the link bands vs. the leather bands. They aren't marketing this as a passing fad. If they were, they would have produced millions of aluminum Watches as the "only" Apple Watch in limited band options.