No you are wrong.
That's why other products are not sold this way, as it's dumb.
You can store, and ship many many more bands seperatly, and just order the colour bands you need more stock of.
You sell a cake with a choice of 4 ribbon colours.
If your cake shop, you have the cakes in the store room, with no ribbons, and you have many hundreds of ribbons in stock as they take up almost no space.
When a customer wants a cake, you ask what colour ribbon they want, then you fit that ribbon to the cake and sell it.
Only a moron who does not understand stock control, would say, ok, the cake factory needs to fit ribbons on at the factory.
So we have to now stock 200 cakes with red ribbons, 200 cakes with yellow ribbons, 200 cakes with blue ribbons and 200 cakes with green ribbons.
that's dumb.
That might work for a company that handles logistics better than Apple.
Apple doesn't do product "bundles". So you'd have a watch at £269 + a strap at £40. That's not the Apple way of doing things.
Plus, from a product perspective, it makes sense to have product ranges - a cheap range, and a higher range. You'd be pretty pissed off if you wanted to buy a stainless steel, or in fact, a gold watch, but everyone who bought the much cheaper sport had used up the inventory of higher end straps.
It's logical to say that they'll sell many more sports than SS or gold. Say, per 100, 80 are sport, 15 are ss, 5 are gold.
You therefore make 80 sport straps, 15 ss straps, 5 gold straps, plus a few extra. But, say 50% of people buy the sport with a SS strap, that means you have to make extra ss straps to meet this demand, or face people buying a more expensive watch having to buy a cheap plastic strap instead. Who wants that?
By doing that, you're introducing the need to stock far more straps than watches. This results in higher costs:
- Higher production costs, since you're making more but probably selling the same number
- Higher transportation cost (more weight)
- Higher storage costs (more space)
- Higher staffing costs (organising stock at stores, staff required to do counts, etc).
Then there's the extra cardboard and packaging, if every strap comes in an extra box. THEN there's the potential lost sales - "I want a SS watch but I don't want a crappy plastic strap with it".
There's far more to it than just "mating" them at the point of sale.
You really don't have a good grasp of retail store logistics. It works for cases, because you don't *need* to buy a case, and there aren't certain pairings that are not going to work.