A Station Eight Fan Web Site
Why did Sevarius leave Gen-U-Tech for Nightstone Unlimited? Xanatos didn't want to lose him as a resource and he didn't become more ethical. Did Demona and Sevarius offer him more money? If so, isn't Xanatos rich enough to give Sevarius a raise? Did he decide to limit Sevarius' creative freedom? What happened?
I'll leave the answer to that to your interpretation.