... your common sense, your sense of logic, your spidey sense to detect BS trained since long time ago, your previous experience, or the fact that you are yet a expert in the topic.

Or just your curiosity and desire to participate in the conversation, that is the correct motivation. To take a chance to improve your knowledge about a topic shouldn't be regulated by a pass.

Everybody wants their paper turning into a breaking new / symbol of authority or just cheat in the citations game, but this is not how it happens most of the time. Most of the time it is just published and nothing happens. Nobody will rush to read your hard work. Is just how it is

Consider how accurate the senses of a person that speaks without observing are. Existing is not license to proliferate otherwise there would be no notion of a cancerous cell, these would simply be another part of the organism. Uninformed opinions are the cancer of public discourse. Uncontrolled growth of irresponsible and subjective thought.

But at least someone made some money.

Yes. Personally I don't see a problem with that if you are trying to achieve a certain level of good response.

Maybe an alternative would be to let the presence of the "magic" word/phrase alter the ordering of the comments displayed to other users, or even "shadow delay" responses without it for fifteen minutes.