I know that CND doesn't like to give you things you can create yourself, that's why they're such a fan of layering. It also helps to serve the professional because it's much less product to buy. Why spend the money with a 150 colors when you could do the same with only 60? It only causes the nail professional to loose money and CND is all about serving the nail professional.
I love CND and what it stands for, but I do see your point. Not only are you using an extra top coat which means more money per service (albeit it's probably only a very small amt of money), but you have to spend time buffing the second coat, which means even more money lost for the technician. You perform a matt manicure 2-3 times and you've already paid for a bottle of a matt top coat. Even if you do charge the client, the client isn't always happy to pay for all these extras. Just like some clients don't want to pay extra for BL under Vinylux to cover ridges on their toes, when they didn't have that issue with other polishes or they were at least able to use a ridge filler. The fact that vinylux lasts 7 days doesn't come into play here because all polish lasts ages on toes.
The same thing happened with the whole LED issue. CND took FOREVER to jump on the bandwagon (and we still have to wait until next year for one to come out) saying that a uv lamp worked just as well. But even if you couldn't beat the 2 min. cure on a uv lamp, you could save THOUSANDS OF DOLLARS (pounds?) with an LED lamp because their power never weakens and you never need to change the bulbs. So if they would save so much money for the nail professional, and cnd is all about serving the nail professional, why o why didn't they bring out an LED lamp earlier???
Like I said, I love CND, but I sometimes I don't understand why they do what they do. I don't work for them so maybe there's a piece of the puzzle that I'm missing.