And believe me, I understand, respect, and appreciate people for that. Most people respond to threads like this in a pretty rude manner, I read previous replies and the OP response and that was all very refreshing.
Thinking it's stupid is your opinion and you are entitled to it, but I think if the artist is stubborn about it and isn't a child the best thing you can do is give them the all of the facts and let them make their own decision.
I want to get published in my own country for myself, if you can't manage that then what's the point in doing it somewhere else first? And I think the appeal to certain people about getting a manga published in Japan is it's popularity there. They think you have a better chance in a more manga-orientated society than their own.
And for the people I mentioned, I know that they aren't any Kubo Tite but I think the fact that he actually got something published is an accomplishment in it's self, no matter how many volumes it had. And I was only trying to give the OP a chance to hear the advice from people who have actually done it as opposed to us who can only offer our secondhand advice.^^