I don't think it's really Ayu's fault. I'm sure that she would've want to do something big. But avex is simply not focusing on her anymore. Now, they have EXILE. And Namie is starting to get her fame back also. She had a fantastic single with amazing sales. Her album did really well. She's getting a new best-of. Plus, she's getting incredible promotion. I guess since Ayu's sales have been declining a lot, they decided to not put all their money on her 10th anniversary. MW did sell pretty well, but let's face it. It wouldn't have been #1 or sold that well if avex didn't do anything about it.
Honestly though, I wasn't expecting all that much from her. So I'm not that disappointed.
MW was pretty much a sucky single with a bad title song. A COMPLETE is kinda useless. Not really interested.