there is a reason why the game has no sound:
it's a passive game, you don't expect sound... so if you play for 3h as newbie.. and then hit a bio where music *is* played... you might have your speakers turned on, and somebody decided to put a nasty speech in it... and you, being at a library comp (or so) get a somewhat red face...
Also, the point about validation is right... as about the filesize. I would have to upload that stuff to my site, and even if not, the biopages would take some time to load.
I the game would be an active client-server game... even then it would need to refresh new music ( I don't think even WoW has own music, they store all graphics on the players comp).