I would direct you to the article which makes the case that not selling on Amazon is not really an option due to their customer base and the fact that they use their monopoly position to penalize you for selling on a marketplace with lower fees, causing all prices to go up, even on other marketplaces. Simply reminding everyone that people can vote with their wallets/feet is an exercise in substituting the complexities of the real world with the ideals of free market proponents. The public cannot be expected to make short term aggregate decisions against their own personal benefit for the collective long-term benefit. That's pretty much the entire point of regulation.