While I understand your principle, let me just say that if your soap costs you $3 to make and you retail them for $5, you probably will never be very successful. A soap that I retail for $5.00 would cost me between $.85 and $1.25 to make! If you are retailing for $5 then you can wholesale for $2.50, and you had better still be making a profit.
Dory, it was just a set of numbers to get the idea out there, plus a lot of people have higher costs than they should but are constrained on the selling price by their target customers.
If you look through my general views on the matter, you'll see I am also a "2x costs = wholesale and 2x wholesale = retail" person.