Many TNR groups, especially in their beginning stages, pay all of the costs from volunteers own pockets. Donations from the public are accountable after a group registers charitable group status. Some TNR groups excel at fundraising, and corporations like Petsmart have made grants available for TNR purposes. The group I belong to received this grant - which covered the cost of really basic things like posters about the program and medical supplies - but the venue was donated, all the spay/neuters were done by licensed veterinarians who donated their services, vet techs donated their time, and many other volunteers donated their time/skills in whatever capacity to make this program successful.
Arguing down to the mileage penny/hourly rate doesn’t make sense. A person who works in low-end retail and a CEO of a large company make wildly differing income - but if they both volunteer to do the same task, isn’t their contribution of time/effort equal ? If a group of volunteers are working together for a goal, isn’t the successful goal the point of the effort - not the individuals ?
You continue to use the word “abandon”. Where I live, to access TNR, you must register your colony, and take an educational workshop. I do not know of any ethical TNR person who traps, neuters and releases cats, who does not monitor the colony, and provide daily food and water and shelters as needed(and medical care). Most TNR volunteers also make great efforts to make the colony as unobtrusive as possible - meaning that they do not leave garbage behind, they take pains to clean up animal waste, and seek permission from property owners. TNR volunteers communicate with each other, and word soon gets out about an improperly managed colony or rogue volunteers. Properly managed colonies are better/safer for the cats, as well as the people who live/work near the colony. Vaccinations are currently 3 year vaccines - and some studies indicate that many cats tested for titers have lifelong immunity from a single vaccination.
I am not sure what cost this brings to a person/family who is uninvolved with feral cats. Attacks towards humans from feral cats are rare, neutered feral cats are less aggressive/territorial towards other cats and people. There are few diseases that can be transmitted from cats to humans, and no airborne diseases I am aware of. Parasite transmission usually requires fecal/oral transmission, but many forms of wildlife also transmit these same parasites.
Sanctuary situations require very intensive management and can quickly go from utopian to nightmares in a short period of time when they become overwhelmed or mismanaged:
Citations are needed for your allegation that more dogs are euthanized in shelters, as in my municipality these numbers are in stark contrast to each other, with many, many more cats euthanized. There are feral dog colonies happening in places like Detroit - where an estimated 50,000 mostly intact homeless dogs are on the loose :
http://cnn.com/2013/08/29/us/michigan-detroit-stray-dogs/
See Eldad Hagar’s many dog rescue videos on YouTube from the Los Angeles area, too.
Caregiver burnout/compassion fatigue is a casualty for many volunteers but also in careers like social work, paramedics, medicine. Does this mean that no one should volunteer or do these careers because they might get burnout ?
You are asking for support for enclosed sanctuaries, but you have not provided any names or links to these groups, or studies that support this as a humane, viable alternative. Feral cats form colonies on the basis of resources, like food/shelter, as well as social/familial connections. They will chase cats out of the colony who do not function well within this community. It is rare for a feral colony to have hundreds of cats in one location. There tend to be adjacent smaller colonies where some members/territories overlap. A sanctuary with not enough square footage will be less humane and more stressful for the cats.
Here are some case histories of sanctuaries gone cruelly bad:
http://www.voxfelina.com/2010/07/sanctuary-in-name-only/
I support spay/neuter initiatives for ALL pets. I support rescue groups who are ethical and humane, who only adopt out s/n animals. I support responsible pet owners, who chose rescue/shelter animals and do not buy from pet stores or breeders. I also support conservation, good science, and ethical/humane behaviour towards people. Plus, I recycle, use public transit, shop in my local community, support my local library and make stuff.