+90% to make it fit into a container.

Grated hard soaps spritzed with water are softer
and a little easier for the brush to get to as a result.
Not a problem in my opinion....

Grated hard soaps can be blended. A little of this
a little of that. Add some kaolin clay, add some
glycerin. Mix or add fragrance... Hard triple
milled soaps are inexpensive but need a bit of help
to make a shave soap. Grating can make blending
your own shave soap possible yet inexpensive.

Fill a small container for travel.

Share a bit with a friend. <--- (should be done more often IMO)

Melting glycerin soap is easy. True soap
does not melt well at all. Just because glycerin soaps
melt does not mean that it is a great idea.
If you over heat the soap it will loose fragrance
and added oils and other amendments will
be lost or separate from the bulk.