Cooking and fashion are much more labor intensive than copying files.
I do get your point though. fashion and files are not the exact same thing, but are more related than one thinks. There's also other effects of the consumer being the distributor. Even 10 years ago there where no scalable method to distribute out-of-copyright works in a non-profit way, and therefor a lifetime of copyright made more sense.
(1) Hopefully has the same meaning in English, what I mean is that it's constructed and not a prerequisite for the act of creating things. Copyright law is cultural, not 'natural', as demonstrated by the pressure of US companies and government on other nations regarding copyright law.