Let's see...might as well. I'm guilty of:
1. You count how many Ayu's are on the cover of the AUDIENCE single
2. You own all of her CDs
3. You pee your pants when you see something Ayu in a place you'd least expect it
6. You listen to Ayu for at least 3-4 hours a day (I use to...but there are so many more artists who beg for my time. ^^

8. You repeat a 15 or 30 second CM over and over just to hear a new song comming out
9. You'll be willing to spend over $1,000 for all her CDs.
10 .You learn Japanese just to be able to sing to her songs correctly. (Well...I knew a little Japanese before I heard of Ayu...but she's helping me with my kanji!)
11.Your room and computer is plattered with nothing but Ayu (I'll usually just put an Ayu wallpaper but...but it's currently FFXII)
13.You tell all your friends about her all the time even though they can't even pronounce her name "Hama.... WHAT?"
15.You love all her songs, even the really bad ones
16.You know in order which CDs were release before and after each other.
17.You went to Gemany and you tried to find the M single (Well...I went to Amazon Germany... >_>)
21.You have an Ayu ringtone (HANABI!!)
22.You can tell right of the bat if something is fake, even if it looks real from a far.
23.You watch Hey! Hey! Hey! and all other shows like that just to see Ayu
24.It kills you to know that some people don't like her