Hi! Interesting thought here,
But people we have in recrutement process ask those kind of salary we didn't made those up. And probably the salary in France are undervalued, probably talents will seek US salaries, but I don't feel that we are losing talents when I see the peiole we've hired, but I don't have the answer here and you might be right. On the salary range it's often wide because we are not looking specifically for senior persons: yes 40k for a senior dev doesn't make sense. Though The last idea doesn't make sense, salaries evolve during the life of a startup and they mostly increase so this scenario wont happen and probably short sighted thinking from you to think salaries are managed in such a simplistic way ;)