Unfortunately post-Diana Britain seems to have picked up a certain scouse quality of grief culture, be it overly aggressively supporting charitable causes or being keen to be seen as being most upset at whatever event (it says a lot that all three England RL internationals have been preceded by a minutes silence including one for a woman who got run over ffs).
You're quite within your rights not to buy a poppy for whatever reason you choose. Whilst modern soldiers certainly put a lot at stake for the greater good they also do it out of choice. On Remembrance Sunday I think it's far more relevant to remember those who died without much choice in the matter, and buying a poppy doesn't make a blind bit of difference to their lives.