Even then... there was no shortage of Rifters since the incentives and rewards of becoming high noble in the Boundless Expanse were simply the sole available method to own a nation or even an empire.
Many current powerful Lineages in the Chained Universe originated from the Boundless Expanse... their ancestors reached the highest noble ranks and were able to build a nation with the wholehearted support of Nocturn's Administration and their protection.
Then, they expanded their roots to the Chained Universe... whether their nation in the universe was erased or not, they always had their home in the Boundless Expanse... unchanging, unaffected by the war outside.
Who wouldn't keep climbing on this platform even if it brought their downfall? At least, the rewards were promised for their efforts and the risk.
Now that Levi was a Baron and was going to be part of this new system, he realized that his situation was quite different... he didn't own Shadowlife seeds, but Origin seeds!
