I don't think it will be as successful as you think, and my reasoning for that is that it really doesn't have much to do with the movie. Don't get me wrong, it's a cool idea and you should do it for the novelty if you want, but if you really want to increase sales you should do something relevant to the product you are selling.

It's probably too late for doing anything with this, but if you do more movies you should consider doing an ARG (like ilovebees, the beast etc.), and I think this would be effective because you are hitting an online audience by releasing a movie that you download. Unless you are pro at creating ARGs, or unless you really put time into it and have a bit of luck it probably won't introduce commercial success, but it would definitely open your film up to a small niche.

Another interesting thing is pricing models, and I think that it won't increase sales, but if some people want to pay more money for extra stuff, they will do so and it will help increase revenue. A good example is at http://joshfreese.com/ (I promise I'm not affiliated, just a favourite musician of mine who had success with this model)