A meme that goes around here a lot is that Mustachianism is about looking at the actual facts and determining what the costs and benefits of decisions are, and then deciding to do only those things that are worth it to you. Your Money or Your Life sort of has this feel to it as well. To a lot of people, not using soap has no real cost and some benefits, so they choose to not use soap. To you, the costs outweigh the benefits.
It's cool to find a bunch of other hardass cheapskates to show off to sometimes, and these forums are great for that. If you want to decrease your expenses further, by all means there are stellar role models living in RVs and building their own 400 sq.ft. houses . If you just want to retire early and buy less stupid useless trash, that doesn't mean you're violating the philosophy, you just have different perceived costs and benefits.