I don't read fanfics at all, I usually ignore them even if they are in the middle of a random thread..(I find that a bit annoying).
I think it's a good idea to have a seperate thread with all the fanfics...only if it doesn't eventually go into eroticism and soft porn fantasy.
There's two sides....I think it's okay to write them and then it isn't... in the right context that is.
To me if you do have thoughts/fantasies/daydreams about Mika then they are personal secret/sacred to you.(because he is famous)
I wouldn't think you would want him to read them if he does come across some.
And then if you do meet him and he looks at you like this.
(It's a small world)...as they say.
I'm not going to mention any names but from experience....one famous singer did find it very offensive on one his forums...about what my friend wrote about him and such.
If I was to write about someone I wouldn't even mention his name if you get what I mean.