number of viewers for the various channels

This question is directed to anyone who has a channel on the Roku. I'm working toward releasing a channel myself, but have had a nagging question of expected viewership. I know this depends greatly on content. And that this might be clearly a out of bounds question, but if someone is willing to disclose or at least allude to the number of viewers they have? I would gratefully except a non fee based response, but would be very curious about any pay services. And yes I know this is a tad ridicules to ask of the pay channel folks. I recall that in June Roku mentioned they had sold 500k Roku's, so the potential user base is at least that. Anyone care to share their approximate numbers.