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pokepal148 Look man, I don't really care how or why they do it. You seem to be coming at this from the perspective of someone in Capcom's financial team. I'm approaching this from the only perspective I have on the matter, which is that of the consumer.
If Capcom think they can make more money by selling Monster Hunter on the 3DS with an ad hoc online feature which tethers it to the Wii U, as oppose to actually building an online feature in to the game, then all power to them. I very much doubt, however, that this decision will actually maximise their profit margins. There are a lot more 3DS's out there than there are Wii U's. There are also a lot more consumers in Europe and America than there is in Japan, and broadly speaking those consumers tend to prefer (or at the very least have more opportunity) to play their games online rather than locally.
I honestly believe that part of the reason Monster Hunter does not reach a higher sales figure in the West is because of the platforms it has been beholden to and the decisions that Capcom have taken. First there was the controls issues of the PSP, then there was the fact that Tri landed on a platform that was quickly declining in popularity, and now we have it coming to Wii U, a platform which (without wanting to sound alarmist) isn't exactly on fire in the West. The 3DS version of this game, it seems to me, should be the version Capcom should be really getting behind. I guess we'll see how Monster Hunter IV goes.
Maybe you're right and smarter heads than mine at Capcom have determined that there's no money to be made in building an online infrastructure for a handheld Monster Hunter game. Personally, though? I'm not convinced by that argument.