I only had 1 listing that wasn't eligible for 'Plus' before I changed the express post bit on my letter box listings, but adding 5c for additional is a good idea, only problem for me is I give extra product for multiple purchases if the postage works out cheaper to send together, and it usually is cheaper, would look strange asking for extra 5c? I get a lot of multiple buys. That being said, if they do make all my listings 'plus', I will have to seriously consider doing just that for the low profit listings, if they don't supply an option for sellers to de-select listings. Thanks for the idea.