[candu]

I'd...search for things I need? Or rely on word-of-mouth via people I actually care about? (Of course, you could argue that these are also forms of advertising, in which case this argument ultimately devolves to "people hear about things most often by hearing about them".)

Or: even though it might be possible to interest me in buying said products and services, maybe I don't need/want them enough to justify the purchase, and so reducing/eliminating pervasive psychological coercion is in fact helping me to act in my rational self-interest?

Also: "most businesses are supported by X, therefore X is good and/or there is no viable alternative to X" just doesn't hold water as an argument. For instance: "most businesses are supported by chattel slavery..."; "most businesses are supported by the local feudal warlord..."; "most businesses are supported by the infinite benevolence of the Church...", and so on - failure to imagine a different model is a failure of imagination and/or historical perspective, not of existence.