Hmm...my opinion: I think vocal teachers are great and you can really learn alot from them. BUT: i think, (and I see this alot at my highschool) people think automatically that taking voice lessons will make you wonderful automatically. This is where things get ugly.
I know a girl who spends 75 bucks a week on vocal lessons and 100 bucks a week on acting lessons...and she still is awful. I take voice lessons once a week for half an hour and I still get better parts than her.
Is it talent? Partly. But I also have a much better attitude and I 'know my way around the stage'. I think making it big factors in many other things besides jsut raw talent. You have to be dedicated. Showing up for class once or twice a week will not enable you to become a star all of the sudden.
Was that a fat joke?