One question - why?
If he is in that bad of shape that he may not survive, why put it through the trauma of the surgery? Does the Vet need practice? Is the crocodile in danger of extinction? Is it more needful to perform free care on an animal than a human? Since we can give away billions to the thieves that get outrageous, undeserved bonus', I guess a couple thousand on a protected species won't really matter and is actually going to a better cause.
*cough* A life is a life. Just because there are not 300 of them left, doesn't mean he should die.
I don't see how it is a waste no matter what species or how common they are.
Dogs are so over-populated it is cruel, yet we spend $1000's on vet bills for them. Humans are also overpopulated, but heck, we spend thousands on plastic surgery, much less life-saving surgeries.
I applaud the vet, whether for practice or not, he probably saved that fabulous guy.
We all have a right to live out our allotted years.