In the time that it's taken to sell 298 CDs, and effectively reach 300 people, you're telling me you wouldn't (for free) make the music available to thousands of users and then just share the hell out of it? How much music gets streamed by Spotify users just looking to try a track out? That too counts as revenue.
If it were me, I'd distribute across as many channels as quickly as possible and hope that I catch on as opposed to "burning out" each channel one by one in the most painfully slow marketing campaign ever.