I think by default you should enable "*less than or equal to* 0," instead of just "less than 0 reviews" - The reason being is that the addon doesn't enable + remove by default (and in my opinion, it should).

As an idea, you should possibly have a button that 'disables' the functionality of the addon, with one exception: In this idea, The addon will still target DIVs that should be removed but instead modify their individual CSS styles by adding a colored border to the sold object, instead of removing the DIVs entirely - This border would enable users to be 'warned' about sellers/sales instead of outright removing them. You could even color code the warnings: red for 0 sales, orange for 50-99% of the users' provided values, and yellow for 1-49% of the users' provided values.

Just some ideas for improvements. Thanks so much for what you've made so far!