This is about the bottom line...
This is strictly a business move by Blizzard in South Korea.
See third paragraph down from bookmark and I've personally confirmed this within Blizzard CS. You can contact me directly if you'd like to discuss/confirm.
Let us be honest here Lore. This move by Blizzard, in fact really shows how much "the suits" are getting their MBA hands into the mix.
MBA Wanker 1: "How do we squeeze a bit more blood out of this Korean turnip (or kim-chee)?
MBA Wanker 2: "Hell, let's bring back 10/25 separate lockouts! That'll keep them playing for 4-6 hours more per week!"
Game Designer: "But North American/Europe have been wanting that too."
MBA Wankers (in unison):While I wasn't a fly on the wall, I can assure you that the above is a close approximation of why this move has been made in South Korea and ONLY in South Korea; not South America, China, North America, or Europe.
"eff those monthly paying noobs! Why would we add that cost to our balance sheet?!?! We'll see no ROI from those monthly paying fools in the States and Europe. Silly noob gamer!"
Additionally, I'm not sure your candy analogy really works here. Unless of course politically, you lean towards having a nanny state. It's not Blizzards responsibility to meter out to us how much raiding we should or should not have. So let's not candy-coat (see what I did there) the real reason behind this move.
Not implementing this in NA/Europe saves Blizzard MONEY, by reducing their operating cost
This is purely a move to beef up Activision/Blizzards Global Balance sheet (they no longer report by Geo, shocking) and it should disgust gamers in general.
That Blizzard will add a feature to only one sub-set of it's base, strictly out of pure greed, while denying it (and spinning with their regular PR bulls#%t) from a large portion of the NA Community that has cried for it.
I realize that part of your livelihood depends upon the game, but spinning this move into one of "Blizzard is protecting you kids for your own good" is a bit demeaning (even tho gamers are by definition unable to control their actions); completely false; and really misses the point.