Okay, lets hire 2,200 voice actors to have every NPC have unique voices and a mediocre at best game.
Learn to appreciate trade offs. Personally I enjoy the VA in the game, especially Doc Mitchell and Mr. House.
Or just have each of the devs, QA, artists, production staff, etc., all voice a couple of lines for the random and generic characters. Save on $$ for the VA, sure it'll take up disk space, but throw a 2nd disc in, problem solved.