Why can't people be this honest all the time
The blatant truth would be that Namco-Bandai are douchebags, but they aren't going to say that. In the Vita's case, they can fall back on the sales excuse (which is legitimate). But let's not forget that these two Vita games are remakes of Japan-only DS games. What was the excuse for not bringing those DS games to the West? Douchebaggery. Why wasn't Tales of Graces for the Wii released in the West? Douchebaggery.
So based on past precedents, would anyone be confident that Namco-Bandai brought these Vita games to the West, if the Vita installed base was already north of five million units? There's still the douchebag problem.