Without reading your link, I can confidently say that salesman ship is the biggest factor in making money.
Indeed, and since I have read the link I'd say the photog in question doesn't seem to have enough of it because he writes details about his "need to have a new pair of shoes every season". It's still very interesting for people wanting to go pro though.
Of all the items in his list I would only find a few convincing from a customer's perspective:
* The cost of the material used (paper, ink, frame, ...)
* The labor fee for a second shooter
* The time required before (competent consultation) and after (postprocessing) the shot
* The cost of the gear (computer/camera) to do these shots and maintaining it (not insuring, mind you)
Still, even with these it's probably hard to "subjectively" justify a $3000 price tag - but everything else is his problem and he can take it or leave it, at least in theory you could do without a car, "small house", insurance, lawyer and website.
Last not least, not (wealthy) enough people marrying and the seasonal character is as it is. Telling in essence that a customer has to pay for you doing nothing in the off-season just won't do the trick - you could still pack groceries or deliver newspapers.... not that I'd favor this, but there you are.