Sorry but it is.
Sorry but your reading of the graph is based on your assımptions, canada,australia,new zealamd are not that small, mexico, south america is not that small, africa is not all poor, with all due respect to my fellow asians is not that rich also.
So the data is there lets not make strange asaumptions that we can argue all day and night
EU is not all europe also so you got other nations there as well, switzerland for example might compete with Tokyo
so asia is not the rest of the world and is not that much richer to spend on hifi than than the rest of the world that is fact
Sorry for this but i can help when we twist the facts
Headphone market size since 2011 projected to 2017:
Green bit is rest of the world (safe to assume it is mostly Asia, as you probably don't need to factor in poor regions like South America and Africa)
Orange is Europe
Blue is USA (which is pretty much the entire NA market)
Only green bit is growing, orange is stagnated, blue has tiny growth. Green is roughly equal to or larger than orange and blue combined, but factor in the growth from previous years it's indisputably the most important market.. So I'm not "believing" anything, that's exactly what the data says. Asia market is more important, fact. I don't know why that is so hard for people like you to accept that Western market is not so important.
Oceania market is tiny and never dictates product trends (I know, I come from there! we only get left overs from US/EU, in fact it's now common to lump Oceania as EU cos we matter so little yet our preference is close to EU), Tokyo alone has more people than the entire Australia and I'm willing to bet more people in Tokyo are into portable audio than Australia!