Traditional shaving attracts some very keen hobbyists whose hobby goes to the extent of making their own shaving brushes and making their own shaving soap. You can see the attraction here, using customised products that are made exactly to your own requirements and specifications to do the exact job that you want.
Shaving soaps are different to ordinary bath soaps in that their purpose is to lubricate rather than to clean. There are plenty of online articles about how the formulation differs. But the chemistry of soap is very simple and you can very easily make batches of it in your kitchen using the exact ingredients that you want. You get to have the fun of making it then the fun of using it. Some of these videos are for normal soap, the processes are the same, it is just that the ingredients are slightly different for shaving soap.