The cost of shaving is....high. This is regardless of if whether you spend money on M3/4/5/6 cartridges and goo out of a can or on str8, DE, Creams, soaps, etc. and the ADs that go with it.
It is a fallacy to think that wetshaving will be cheaper, it is definitely not cheaper and often more expensive if you are afflicted by RAD, SBAD, SCAD etc as I am ;)