I would be willing to believe that a 2-pack would be more likely to our western market as well... as a single figure on the shelf in either mode, wouldn't scream out as being anything special to those unfamiliar with the Masterpiece line.
These might be aimed at collectors, but TRU (here and America) still prefer to cater to the regular shopper as well. (a bit of the reverse of the regular stuff, in which our (collectors) 10 or so percent of sales is still needed, but not the primary focus... the 10 or so percent of non-collector sales on these collector items is needed, but not their primary focus)