To be fair, I should mention that it's only important if you're either (1) advertising with a very high bid for a reasonable amount of time or (2) promoting you

To be fair, I should mention that it's only important if you're either (1) advertising with a very high bid for a reasonable amount of time or (2) promoting your product organically by posting it as a link/self-text post. For the first case, it's beneficial to have the appearance of good-intentions if comments are enabled. For the second case, it's critical because your exposure is determined based on your score from upvotes and downvotes.