This constant Vita hate/bad sales predictions is baffling. Even more so when people are too kind on Wii U.
These are taken from NPD and Media Create threads
WiiU USA + Japan Sales:
2.4 m + 1.82 m = 4,22 m
PSV USA + Japan Sales:
1.8 m + 2.93 m = 4.73 m
So that leaves Europe and rest of the world. And we know which system has gotten negative shipments.
Oh and any counter argument that PSV has been on sale for longer is bit stupid, because we are still comparing PS3 and X360, PS2 and GC&Xbox etc.
Sony made clear what their position is when it comes to PSV. No need to get defensive just because people are stating the obvious. About your comparison, it´s rather useless and by the end of the year even this "point" will be void.