That means that if you want to be independent, say the truth, not sell out,  not try to appeal to the lowest common denominator... you have to have another source of income.

Alternatively embrace the marketing aspect of it and be as honest a salesman as you can, keeping your independence by selling multiple competing products and giving your honest opinion about each.

Or, a reasonable compromise, choose what you think is the best, most positive thing to sell and then sell that. Explain to your viewers that you could make more money selling X shit, but you think that Y shit is better. Long term what you gain in loyalty and respect for your honesty can compensate giving up on the quick buck.