None of these web monetization efforts address the fact that the pool of [all consumers' discretionary income they'd be willing to spend] is likely a small fraction of the size of [all commercial companies' marketing budgets]. No matter how much you reduce the friction for having people make small tips to websites, there's just significantly less money to go around, so it can never replace advertising revenue. The on…
Assuming you meant all spending, this cannot be true, because all marketing budgets are paid out of people's spending. You are paying for advertisements, they are included in prices of goods and services you buy.