The point about private and personal remembrance is a similar arguement for not going to church of a Sunday.
We are all capable of private remembrance but the point of going to church, and indeed wearing a poppy, is collective remembrance.
That some people wear them in advance of public sale is not oneupmanship but advertising?
I was at an RBL luncheon on 24 Oct. Quite a few poppies were in evidence at the lunch from the Brigadier down.