That is a Sony thing, for some stupid reason they almost ignore US, they do the same thing with Smartphones too, but of course Kaz comes in and say that they will invest in the market later and all the Kaz fangirls says that it makes sense (blindly), when fact is it makes no sense at all. Xperia and Playstation brands are weak brands in US (Xperia being a newer brand with playstation getting weaker year after year), a huge market and these guys just ignore it like no biggie.
Just look at the PS3 this holiday, there is a Watch dogs, AC 4, Batman, and a GT plus last of us official bundles coming to Europe this year, were are these in US? The guys working on the US part of playstation are so stupid that knowing how they struggle in the country, they made the new blue playstation a gamestop exclusive, wow.
And look, I am not saying that they would sell crazy numbers, but how can you be selling like crap in a country were the competition is from, and make so many rookie mistakes that cost them consumers regardless of how many. You can even look at how much it took them to get the 12gb PS3 in there...... just retarded.
Same thing with the vita of course, but I believe the machine has bigger issues but still your point is still valid
