User blog comment:Tyrone851/Fairy Tail Crossover Movie (including DBZ, One Piece, Naruto And Bleach)/@comment-24390892-20140107033549/@comment-4829046-20140107093652

Actually, those aren't reasons. OP had crossovers with DBZ and Toriko, both of which lack any real piracy or even sailing for that matter. And Rave can have a crossover CAUSE ITS DONE BY THE SAME AUTHOR. Also cause crossovers are usually non-canon.