I always refuse to wear a poppy, even though I happily put money in the collecting boxes. That's because I don't believe in commemorating the dead but I'm happy to help the living.
A friend once berated me for not wearing a poppy, despite the fact that I'd put several pounds into each of five separate RBL collecting boxes, yet he happily told me that he'd avoided contributing anything because he was wearing a poppy which someone else had dropped!