This is an interesting thread and conversation. I don't believe that Jeffries is profiteering from this, as it's a flickr set that has gone viral in more ways than one. Petapixel.com had posted on this last week, with the short backstory on how his images came about. Here's the clipped quote:
Photographer Lee Jeffries worked as a sports photographer before having a chance encounter one day with a young homeless girl on a London street. After stealthily photographing the girl huddled in her sleeping bag, Jeffries decided to approach and talk with her rather than disappear with the photograph. That day changed his perception about the homeless, and he then decided to make them the subject of his photography. Jeffries makes portraits of homeless people he meets in Europe and in the US, and makes it a point to get to know them before asking to create the portraits. His photographs are gritty, honest, and haunting. - Michael Zhang of petapixel.com
The photographer puts sincere effort into getting to know his subject, like any good portrait photographer. His approach was governed by a chance encounter, and has led him to emphasize this group of people in his work because his heart goes out to them, and this is the best way for him to make known the struggles of these denizens of the earth.
This isn't just capturing an image of a helpless person and scampering off to sell it as stock or fine art. It's documentary and real and unsettling. Much like Seamus Murphy's set of Afghanistan that recently was highlighted by PDN, his portraits and images of a broken people were not for profit, but for love and compassion. Watch the short documentary produced by him and MediaStorm, and it's unreal how the images speak volumes for people that usually have no voice in the social atmosphere of the world. Here's the
link to the video, it's 30 minutes long and worth every second.
These are some of the best examples of this new era of photojournalism. This is intimate and exclusive knowledge more easily shared in this age of information. The other posters have been right that it's become too common place to think that releases need to be served in the public forum, and for work that resembles "fine art" but serves another purpose - public knowledge.
As a note, I don't personally care for Jeffries heavy hand in post, but still enjoy the photos immensely. My favorite was the last one with the guy holding up his syringe. That and the one of the London girl that is only on his flickr and in the petapixel.com article, somehow CNN seemed to omit the image that started it all...