Want to know the reason the Asian market are getting XP Potions? Because a lot of them have limited gametime. China in particular puts a debuff on a character logged on for too long that halves their XP gain in order to convince them to stop playing for a while. The potion would give them the option of rushing the leveling process to make best use of that limited time. Same could be said for the Lesser Charms.
And even then its still not manditory for them. Do you really think XP Potions will work in the next expansion?
As for the helmets, who cares? Don't demand new character models in the same breath, that's infinitely more work then a simple helmet. Don't claim the character models will be paid micro transactions when you don't know a damn thing. Its all fearmongering speculation, ironically from people who often either don't play or will threaten to quit the second anything happens. We don't need you, trust me.
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Not Blizzard, but the companies they subcontract out to. Blizzard doesn't actually make that much off China due to having to constantly adjust the game for them.