Going back to 17C Holland there was probably a huge demand for market traders able to distinguish fine differences in and trade tulip bulbs, until all of a sudden there wasn't - this is the kind of illusory value the writer posits for today's fêted startup web workers. I'm not sure I entirely agree, but it shouldn't be dismissed out of hand, because he's not just saying it's unfair, but that it may be unjustified.
The price of a word is being bid to zero.
This sentence near the end cuts to the heart of the matter for me - for writers or other producers of original content like photographers there is a cruel and dismal comparison to be drawn between the wages of those paid to frame content and present it to the world, and the wages of those who produce the content. The creative content (writing, photography, art, travel guides etc) is all in demand, but no-one wants to pay for it, perhaps because it's so easy to produce something yourself, and so hard to distinguish the fine differences in quality which separate a remarkable piece of writing or photography from the mediocre.