Time to post a real post and not bullshit!
From my perspective I'd say that having the voice acting, when thinking in some... reverby voice would be fine I think. It works in the movies it should work in games as well. It's not difficult to apply so it's fine.
In addition, I have a feeling, but it remains to be seen, that voice acting does not need the 'perfect' quality. It shouldn't make too much difference if it's mono or stereo (whereas in music it does play an important part), and as long as it's not a completely lousy compression, it should sound fine and keep the voices clear and crisp, as they should be.
Given that I'd think that the added size wouldn't be substantial! Especially considering that the game is low res, thus graphics don't take too much size as well.
From Vince's part I'd imagine that he'd be swarmped with voice acting files, which is rather difficult. I mean it could very well get over 500 files, or more, which is a nightmare to keep tidy and all that. Plus the (probably) additional pay, and everything else. The compromise of having the thoughts silent is not a bad one, but it does remain to be 'voted' in or out by the beta testers...