popa_bar_abba:- Please bear in mind, that in addition to whatever physical benefits you may be limited to, because you are group “O”, I didn’t even mention what spiritual rewards a blood donor receives for Chessed, Lo Sa’Amod Al Dam Rei’acho, saving human life, etc.
I didn’t mention the spiritual benefits in my 1st posting, as I didn’t think that you popa_bar_abba would be on a level to comprehend this. But this may be a last resort to mention this to you, to convince you, to rethink your original stance.