It's just an exaggerated effect of style. You aren't going to find a single piece of fluff where a guy gets eaten every ten meters, unless that particular piece of fluff is about the Forest of Loren or the Wastes. It's like in Warhammer 40K, there is not only war, those people eat, love, go to work, live their lives and I'm sure certain planets have no seen war for generations. How would you expect anybody to be able to live there, you won't feed a city like Altdorf with peasants that risk their lives just by sleeping in their warp-mutated bed, then have to survive the morning 1 out of 6 chance that their mug of milk is going to rip their face off, try to not get cut in half by the carnivorous door (old oak, it's failed its test a wile ago...), manage to get up the road of bloody teeth and work their ass off all day long in the field of acidic grain (to harvest what, poisonous corn?), etc etc. The whole of humanity would be wiped out in one day

So I take it as an hyperbole. Let's be honest, volcanoes swallowing cities, as surprising as it is, are rare in Warhammer, whatever that blurbs say. Can't think of a single occurrence in anything I've read about Warhammer.
But if I had to take that seriously, yeah, no doubt, it'd skyrocket in first place
