This is what I was told about this on the Dragonsfoot forums:
"On another note, ACKS is great but I think you should be careful with it when it comes to numbers. My impression is that it’s really based on a strong, specific assumption that the campaign world is more or less your Ye Standarde D&De Olde Worlde with a generally medieval technology and social level and with a single barrel of ale costing a gold coin (or whatever the case may be, you’re familiar with the Solid Gold Bedrock 3’ Under trope).
If you’re trying to do a sword& sorcery world where man is trying to carve out a narrow niche in a primeval universe of swamps and dinosaurs, many of those numbers and assumptions might no longer make sense. Items might only be available in much larger population centres than indicated in ACKS, if at all. Prices, incomes and everything built on those would probably be also very different. And, in fact, I’m not quite sure if the basic assumption of a feudal society is applicable."
http://www.dragonsfoot.org/forums/viewtopic.php?f=11&t=59729&p=1325710#p1325710
What do you think about that?