I think Autumn is right. Even if someone bought a paper poppy every year for 15 twenty years it's the same as buying a posh one from the Royal British legion, wearing it for a few years til the pin falls off then replace it. Plus there are other ways to donate such as collection boxes and other items. I bought poppy cufflinks for my husband.
The heart and intention is there so I am sure the RBL would be glad whatever kind of poppy is worn.