What do poachers get for poaching?

Nature is a big place, it's impossible to watch it all. And animals can't call the police when they feel threatened. Unless someone see the poachers - which is unlikely as Nature is a big place - the poachers can get away with killing endangered animals.

Endangered animals in countries where the average pay is low, and that that are popular tourist attractions - like mountain gorillas and somethimes rhinos - may be watched 24/7 by rangers to protect them from poaching.