Just the threat of the Space God King already makes it difficult for the Undead Divine King to protect himself. Unless the threat of the Space God King is removed in the future, even if Zhou Tian dies, the Undead Divine King will inevitably be powerless to seek revenge.
Thus, given the situation at the time, it was not surprising that the Space God King, willing to pay the corresponding cost, would enlist other Divine Kings to deal with Zhou Tian.
The outcome was unsurprising to others.
If the Space God King was unwilling to invest, he wouldn't have had such a notion at all. But since he had decided to have other Divine Kings eliminate Zhou Tian, he was indeed willing to spend whatever reward was necessary.
It's not that the Space God King was a stingy deity. Even the most stingy deity, thinking of what Zhou Tian had done, would probably be willing to go bankrupt to have him taken out.
