So, if this is true, then why does Bombadil save and help the ringbearer and his companions? Because they can bring about the downfall of Sauron, the current Dark Lord of Middle Earth. When Sauron falls, the other rings will fail and the wizards and elves will leave Middle Earth and the only great power that is left will be Bombadil.
There is a boundary around Bombadil’s country that he cannot or will not pass, something that confines him to a narrow space. And in return, no wizard or elf comes into his country to see who rules it, or to disturb the evil creatures that gather under his protection.