It seems like this is 1 feature which might be interesting to bloggers/podcasters. Is there a more generalized "podcaster sweepstakes platform" you could build? Help bloggers/podcasters engage their audiences more around giveaways/sweepstakes to generate buzz and attention, track brand impressions/dollars, present network of advertisers, etc... I'm not a big blogger or podcaster so I wouldn't likely be the best person to design this product to solve my problems. But reach out to real users/partners/potential customers. They'll likely tell you what to build.