Despite the inability to possess the immortal continent, they are still very valuable to lay claim to. Even some world gods try to lay claim to them for reasons other than their everlasting properties.
Immortals care for little apart from pleasure and benefits. They certainly do not care for the ownership of land to lay their heads. Every Origin god can live in their domains. It is not safe as anyone can sense it and barge in. But then again, what is completely safe?
However, these immortal beings fight tooth and nail for the ownership of the immortal continents. Every Origin god wants them because of the springs that produce soul stones. This violence and competition is a serious and rampant issue because the immortal lands are not enough to go around.
The immortal lands are in limited numbers and an Origin god can never have too many soul stones. This has made soul stones very difficult to acquire if one doesn't have a world god to rely on.