I also misinterpreted the OP's initial intentions and thought that this was some scheme of his to get professional-quality voicework for free, but it would seem that is not the case, so I apologize, Gnostici.
No problem, Quanta. Note though that exposure is never promised in any realm of entertainment. Generally speaking, all projects tend to have a rather optimistic atmosphere. Visit a movie set, and you'll never really hear anyone say, "Well, I don't think this movie will make it," whether the movie ends up succeeding at the box office or not. The same applies in music, radio, television, and even in voice acting for major titles. The goal for an aspiring actor is to get work done that they can cite, and not necessarily to create amazing resume entries right off the bat.
That being said, exposure comes when a mod is well-received by the community and reception comes when the community recognizes superb voicing. Aspiring professionals who are recognized by the community certainly have accomplished something resume-worthy. In fact, that recognition is not a necessity for their work to be worth citing. It's possible for a mod to get zero attention even though it has amazing voice acting, so the work becomes what all entries in art portfolios are: An example of a creative product. If you want people to know that you can draw, then you draw and show it to people. If you want people to know you can voice, then you voice and share it.
Furthermore, this initiative offers something new for current voicing professionals: A way to interact with the community to promote themselves. Imagine if the talent behind, say, Sheogorath sees a mod he likes, gets permission, and offers to throw his weight behind it. That's a public-relations goldmine that could build his fanbase and lead to more work. When people start asking for particular talent in any form of entertainment, producers tend to listen.
That being said, it's entirely possible that the opposite could happen, but this too is true in all forms of art. An aspiring painter may include works in their portfolio that are simply horrendous and detract from their career, but it's their work and their choice if they include it. Similarly, there may be instances of terrible voice acting being cited, but that lends to the possibility of constructive criticism and expansion of a developing actor's or actress' skills, and it's a natural part of the process of developing a marketable style. You might be surprised how long, tedious, and unforgiving that process can be for some art forms. Authors in particular face years of rejection and harsh criticism prior to any career-building recognition, but you can bet that their contest entries, columns, and other such bits of work are still cited as examples of their abilities.
Important Edit:
Why should anyone use the Creation Kit if they can't reproduce other titles by Bethesda, free of copyright restrictions? Why should someone buy a video camera if they can't use it to record in the movie theater? Why should someone comment on YouTube if they can't just repost the successful work of others for their own gain? Why should anyone buy a shirt if they can't counterfeit brand names? I think you see why. We can't stop people from revoicing, and I wouldn't even want to try. However, that does not mean that we have to promote it nor does it mean that revoicing is the ONLY kind of voicing that can happen. If talent privately decides with a modder to do this, then it's their business, but we can't allow the creation of this initiative to become lawsuit fodder. That wouldn't be helpful to anyone. Furthermore, I think it's in the interest of the community to be on the good side of both Bethesda and current voice talent. So, it's a matter of ethics, legalities, and common courtesy.

Second off, why don't you report the facts correctly if you're going to drag it over here? Tell them how you offered us nothing in this proposed partnership except for your hypothetical traffic and expected us to just sign up and bring along all the hard work we've invested for 4 years while getting nothing from you in return save a notch on your wall and whatever attention your threads garner? How about you tell them how when your request was politely declined because we already have a similar and functional operation in place with a lot of time invested, which you were invited to join, you started throwing insults about how we care about tenure and personal glory over the community.

Posting that conversation isn't going to help your case. You were new to our site, not knowing you from Adam, I simply offered a basic breakdown of who we are and what we do, and then told you in polite friendly terms the reasons (plural) we were not interested in a partnership: because we have A, B, C, and D and you have nothing, there's nothing in it for us. Moderation over what? You say I made a call based on false information, well bud, it's the information you provided for my consideration. This community belongs to everyone, it's not my territory, there are blokes in this thread alone who deserve way more grass than me. What I am defending, what is my right to defend, is what we have worked hard for in the face of your cross site defamation, but again you can't accept a "no" without defaulting to making false accusations about my character. 
They are making money from it (of course not)