The thing is, I've read one or two good one piece fics and laid disappointed because they all rather seemed to fall really flat compared to the actual manga.
One Piece is just so ridiculously outlandish in a good way that nothing that anyone else can think up will ever hold a candle to the original author. For example, Luffy faces off against a new pirate crew which is somewhat sympathetic from the get go and has some cool sounding characters in a fic. It sounds interesting. You look at the manga and they are in an island ship full of odd looking undead creations and it seems like they are losing to a character you very much grow to hate. It is even more interesting, and it makes the fic look worse in comparison.
I had a firmly established belief that the more one person dislikes the actual canon of a story the more likely they are to write a fic to correct whatever it is that they don't like. For example look at Ranma. While a lot of people liked the manga, they were left very unsatisfied, so fics where written. Look at Naruto. People hate the canon so they write fics to correct whatever flaws they most hate.
One Piece is just so ridiculously outlandish in a good way that nothing that anyone else can think up will ever hold a candle to the original author. For example, Luffy faces off against a new pirate crew which is somewhat sympathetic from the get go and has some cool sounding characters in a fic. It sounds interesting. You look at the manga and they are in an island ship full of odd looking undead creations and it seems like they are losing to a character you very much grow to hate. It is even more interesting, and it makes the fic look worse in comparison.
I had a firmly established belief that the more one person dislikes the actual canon of a story the more likely they are to write a fic to correct whatever it is that they don't like. For example look at Ranma. While a lot of people liked the manga, they were left very unsatisfied, so fics where written. Look at Naruto. People hate the canon so they write fics to correct whatever flaws they most hate.