First class has no appeal to me. I routinely turn down upgrades. (Albeit, not based on anything I'd see through the curtain.) "Extra service" is nothing but a nuisance when I am trying to work, read or sleep. I don't eat or drink airline offerings. Economy Plus offers adequate room for my 1.92m/60kg self. Far better someone else should get the upgrade.

Additionally, I don't 'do' aisle seats. I'd prefer a coach middle seat to an aisle. So that'd be another reason for a 'no thanks'.