Posted at 2013-03-29 00:53:49 — Link
In the announcement it says "The Golems live 10 days providing 1/10 of their total material resource each day." That means that in the end, you'd end up with just the same amount of material you used in the first place.
But the Cotton Golem for example costs 30 cotton to make, but produces 6 cotton a day - so in the end we have 60 cotton, twice the amount, which means it provides 2/10 of its material resource each day :)