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I'm not sure what animals you are talking about that kill humans on a regular basis and are protected by billions of dollars. All I can really think of that kill off mass amounts of humans are mosquitoes laden with diseases, but I haven't heard people trying to save the mosquitoes.
Large animals such as elephants, sharks, etc. do kill people occasionally. But these killings are often a natural instinct, either the animals feel threatened, or feel their offspring are threatened. Very few animals will actively hunt humans and if they do it is usually for food.
Should we go back to large-scale whaling practices because a single whale knocks an idiot off his boat that gets to close? There are so few of these animals mostly because of humans and yet they are still extensively hunted in parts of the world. Money goes into saving these animals because some people realize it is our own fault that certain species are nearing extinction.
Additionally, killing off top predators can be devastating to the food chain. Those a step below begin to flourish, but end up in overpopulation. As their food supplies become scarce, they may die out and the effects can snowball onto species below.
In many cases, little money needs to be put towards saving the animals. Proper legislation and environmental practices can save them much better.
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