If I'm not wrong, the PR for MHTriG and MH4 talks about "expand" the userbase, not to transfer from one "portable" to other.
In other words, to create a userbase in Nintendo portables + Sony portables, not to go from PSP to 3DS. Also, Nintendo is getting the numbered MH games, while Sony gets the bigger portables series. Not the same.
So, to me, there's no moneyhatting. Maybe Nintendo makes a deal to promote and bundle with 3DS, a handheld with people that buy DQ, 2D and 3D Marios, Pokemon and other middle-big franchises.
Proud to be the first cool Nintendo fan ever
Number ONE Zelda fan in the Universe
Prediction: No Zelda HD for Wii U, quietly moved to the succesor
Predictions for Nintendo NX and Mobile