Japanese art is part "Art" as we know it, and part marketing. That means creating art with the premise of selling it in mind. Not necessarily creating art for pure profit, but creating art that the average person will look at and say, Hey, I like that and I can actually buy it! You could also look at this as selling out, but that's for you to decide.
Meanwhile, the Western art world is build on what you find in museums and the homes of the wealthy; the majority of the common people don't own art, or at least don't own things that they consider to be art. Furthermore, 'high art' is often in a world of it's own; the average person sees it as unusual and sometimes just pointless, and would hardly even think about owning it.
That's not a v100% accurate paraphrasing, but I tried to explain the present-day art world struggle best I could, so take it as you will.