SWTOR did - with different voices for each of the eight class choices. With male and female options that made for 16 voice actors just for the player character. Cost them a lot of money which didn't go to endgame content - with the result that when the game launched, and players got through to the endgame and found there wasn't much of an endgame present, players left in droves. They later added more endgame content, but not quickly enough.
In later expansions SWTOR has cut down heavily on the voice acting. Seems it was just a bit too expensive to have voice acting everywhere.