I understand when a service requires payment so that creators of the add-on won't pay for the service from their own pocket, but in this case there are other add-ons which are using other methods that doesn't require useres to pay for such add-on, thus 2 stars. 1 stars for good looking layout, 2nd star for letting people choose how much they are gonna pay for this add-on (but I won't, lol XD).