Well, I'm yet to be convinced that they're unnecessary. Besides, if I'm gonna start regretting every unnecessary consumable I've ever paid for I should probably start with, say, tequila or croissants which have additional deleterious effects.
On a risk/reward scale, giving up on shampoo and soap just doesn't seem to cut it. The best I'm going to do is save a few tens of dollars a year, while the worst I'm going to do is have everybody who encounters me react subtly worse to me, perhaps without even knowing why.
I'm willing to pay the cost of the soap just in order to have the peace of mind of knowing that if people do dislike me then at least it's not because I'm filthy.
