you can never find the commercial value with out actually monetizing the traffic. But as a seller , you can say " I am making x amount currently i need 10 times or 20 times of x amount". That will happen only when you are making that x amount.

The best thing would be to run an auction with a high reserve price on flippa and see how much the bidders are ready to pay. Because there are lot of experienced marketers on flippa who would know how to monetize your traffic. You can sell it if you are happy with the bids. That would give a rough idea of worth of your channel/traffic.

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