I’ve been selling liquid and bar soap at local markets for a few months now. Every single day at least two people ask if I sell shampoo bars, and then most times we get into a friendly discussion about soap versus shampoo/synthetic surfectants (this usually involves me explaining basic soap chemistry stuff to people but not always). Many people just don’t know the difference between soap ans other cleansers...”but the shampoo bar I get from Lush is really nice” is a common refrain).
People really want them mostly down to marketing, I think. and some people who “make soap” don’t worry too much about details or chemistry. (I’ve spoken to many people who happily tell me they make soap too, which ends up usually meaning they melt soap, or add fragrance to a commercial liquid soap base.)
I always explain how soap is not really the thing for hair (or dishwashing liquid) which is why I make neither. And that they would probably need an acid rinse, and might damage their hair. They mostly still want to buy it.
I’m *really* close to just giving in and making some*, since it will sell really well, even with my explanation that they probably shouldn’t use it in the first place.
*(which would involve high superfat, citric acid, and lots of castor oil...as far as I can tell, pretty much all one can do to still not even really make shampoo.)