This seems to completely ignore what you'd be doing for this company. This kind of living costs calculation (or something like it) is useful if you're starting

This seems to completely ignore what you'd be doing for this company. This kind of living costs calculation (or something like it) is useful if you're starting your own company -- and want to figure out what profit you'll need to be making before you decide "this is worth the effort". But if you're being hired to do a job, this isn't a good approach.