If I'm sure of something is that Ayu listen to her fan's requests and try to make them possible if it's in her hand. But she depends on Avex.
Like
njanjayrp said, it could be even better that she visit more countries for small concerts, instead of doing big ones. That way would be easier for everyone to attend.
I am a big fan and I could try to go Paris or London, not sure because of the big money disbursement, but I would attend for sure to a concert in Spain, and my friends, even not being really huge fans could attend too. I know at least 6 friends (not Ayufans) would go if it was in Madrid. I think you get my point
It could be a series of small concerts, like the Limited TA Tour she held, just a couple dancers, no costume changes, something humblest than her Japan concerts.
edit: lol aura~ XDD we thought the same!