Of course, Draco and Eva could be greedy all they wanted, but it was impossible to act on their desires. After all, was the fragmented Eternal World something they could take away?
Just because the World Will was nice to them because of their high talent didn't mean that it would sit and watch one of its pieces taken away without sufficient compensation.
Besides, even if they took it away, it would be the epitome of foolishness to take a plane from a superior world/universe to a lower one, which was where earth was. Assuming the plane doesn't shatter the lower universe or the plane gets shattered by the lower universe, it would definitely lose a lot of what made it special.
So obviously, the next best thing would be to find a way to connect the lower universe to this plane, allowing them to come and go as they pleased. This was what Draco and Eva were currently working on passively as they continued to hunt.