Well the comments here terribly disappoint me. Clearly the photographer wants to be paid as a professional, just like anyone else here. The author should not have included any monetary figure in the article as doing so brings down the wrath of a thousand pedants with pocket calculators proving he overcharges and overvalues his work. So many people here seem to think they somehow "got him" on some straw-man price-poin…
I think the comments are fine, because the entire premise of the blog post is wrong. He should be paid because his skill as a photographer is worth money, not because he paid for a lot of expensive equipment.
There are two kinds of photography, 'on demand' and 'stock' which is to say you hire someone to come out and take pictures at your wedding that is 'on demand', you need a picture of a waterfall in Hawaii to put into a travel brochure you find one in a catalog, that is 'stock'.
The guy who takes wedding pictures has lots of great equipment. The guy that shot mine brought three cameras, one for shots around the event, one taking shots of the location , and a portrait setup for one on one pictures. Now he probably had 15 - 20K worth of gear there, but he does 10 - 15 weddings a year. So even amortizing with a lifetime of 3 years for each piece of gear his equipment 'cost' is worst case 30 shoots, so $666 per shoot.
I really do think the think the effect here is that it is so easy to put photographs on the web, and for many folks they just took the picture for themselves, they don't have any problem at all giving people rights to reproducing their picture anywhere. So people who acquire pictures ask for it free first, and then if you respond that no, you are only interested in selling it, you can come to a negotiation over price.
Unfortunately, from what I've read on photography blogs there are also some pretty large price / value discrepancies between photographers and buyers. This seems to lead to a number of blog postings like the one referenced with (often) one side of the story.