Most I'll spend is $20 USD. And it better be really good "artisan" soap at that price.
There was a time when $20 was the most I would spend on a soap, but over the past few years, many soaps have gotten better AND more expensive. There are some soaps I have tried and consider to be overpriced- their performance is not commensurate with their pricing. However, I consider other soaps to be worth every penny. Although Grooming Department Nai base is expensive at $32, the performance is worth the price of admission, at least for me. One of the best bargains is Declaration Grooming Milksteak. Depending upon the scent, they are priced around $20, but performance is outstanding.
A lot of people purchase less expensive soaps and then go out and purchase pre-shave lotions, aftershave splashes, balms and serums because their soaps are not good enough. I would rather spend more on a great soap that has no need for those extra products.