There have been a handfull of successful anarchist societies throughout history.
If mankind could get over it's need to worship sociopathic leaders, perhaps we could all live in an Anarcho-Syndicalist Utopia (well, the closest thing that there humanly can be to utopia).
Why are they not thriving now if anarchism is capable of success?
How well did such disorganized groups compete against tighter organized neighbors?
It is in mankind's nature to compete for water, arable land, prime fishing territory, valuable ores etc. You can try to pick this apart by pointing out that the Apache didn't care about mining gold in the 1840s - 1890s but that did not relieve them of the need to compete with, get the hell out, die, or surrender to, white settlers that wanted that gold, copper etc in their territory. No amount of proclaiming "But we are an anarcho syndicalist cooperative" would have changed the outcome there.
As for Josiah Warren asserting that the value of an item ought to be commiserate with the amount of labor required to produce it rather than perceived market value - tell me again why diamonds and gold sell for so much if Josiah was right. People voting with their wallets have rendered his assertions moot. Saying otherwise is coulda, shoulda, woulda pie in the sky, of no more practical value than saying "Help me Jesus" when the SHTF.
People tend to compete more effectively as an organized unit of 30 or 40 than as a set of 100 randomly thrown together individuals. That is why the USMC trained you the way they did and why the Bolsheviks kicked the anarchists ass in the consolidation/mop up phase of the civil war that followed the October revolution.