This sort of thread often made me click and read and it's worked on me, so I hope it works on you too.
I gave blood today for the the first time. I got thank yous from the staff, a drink of squash and a biscuit. But I thought people got stickers or badges for donating. And I never got one. 
Anyway, I don't really care, but if you could think about giving blood next time it's near you, then I think that would make up for no sticker 