Kind of cute to see a bunch of posters here who are clearly older and are proudly denying the value of youtube for audio reviews. And why bother telling the OP that you never watch them? Clearly, this is of no help to the OP and no one else really cares.
But the OP is asking for advice because of a business venture.
Youtube audio reviewers have hundreds of thousands of subscribers and even higher view counts.
My advice, OP, is that you look across the channels and look at view counts, subscriber numbers, and product types. And that you disregard cranky old opinions about how worthless youtube is.

