Given all the wacky art and mashups I love to death, I fully support the remix. I find that a great deal of art's glory lies in the fact that a single item has essentially infinitely permutations. Nothing amuses me like the grin I get when I see or here something that takes something I already know and manages to make a total surprise out of it.

Also, for the "pomegranatety" youtube music remixes, many should probably be considered as practice for amateurs. People who are too new to the skill to be able to start from nothing and need a way to hone their craft from a template. Much like tracing a drawing as a young artist.