I like bagpipe music as well but I think they should have a bagpipe convention for the good of the genre and all agree NOT to play "Amazing Grace" for the common good.
Must be something about that tune that is REALLY easy to play on the pipes. Sort of like STHeaven on the guitar. (tip of hat to Wayne's World the Movie)
It's pretty easy to play, mostly because (1) it's slow; (2) there aren't many grace notes (I always found that to be the hard part).
The main reason is, it's NOT a pipe tune. There are many beautiful pipe tunes that could be used instead.