Lots of writers and philosophy postgrads get paid less than this. I don't mean to discourage people with fewer qualifications - a PhD is not required - but we posted a Craigslist ad recently for a different potential position, at a similar salary, and got applications from PhDs with 3 years experience. In any case, we shall see what the market thinks of our offer, and I see no reason for you to take offense at it a priori.