Let's first introduce our main actor, the Rheobatrachus silus. This frog was (or is) an Australian frog with one peculiar habit: following fertilisation the female would swallow the eggs, which would develop safely in her stomach. Once the tadpoles had metamorphosed into small froglets they would be 'regurgitated' out by the mother. Nobody knows why these frogs went extinct (the fact that they were a small population to start with did not help either), though infectious diseases might have played a role. People of the persuasion that we should put a price tag on everything should consider what a wonderful model for gastric inflammation we have lost.
Human ingenuity and technological advances can sort many problems. Extinction is not one of them. For complex animals such as amphibians the chances of undoing our actions on the natural world are slim. And what is potentially worrying is that the false security that 'we can clone them back to life' will stop people from preventing extinction in the real world in the first place. So, once more, what are we trying to achieve? And are we sure we are using our resources to best effect?