I'm sorry, I don't get it. Why buy a switch for its colorway?
It isn't seen when you have keycaps on.
Not necessarily. Clear and floating key cases do exist. Even if you don't see it, sometimes people want that extra color matching for fun. It's nice to know everything matches, and you can admire it even when cleaning!
Also, the colorway can distinguish them from other switches. Most of these have non-standard springs and housings. Before Novelkeys was stocking milky tops/black bottoms, only Tangerine had it. Linjar has an all nylon housing. Material is very important for sound.
Pretty good deal for only 10-30 cents more than normal Gaterons.