The death penalty makes no sense.

[Anomalocaris]

Can pay death with more death ?

You didn’t answer my question.  Why should BTK get to wake up every day and eat a hot breakfast, take a nap, feel the sun on his face even for a minute, or sexually pleasure himself to the memories of the unspeakable horror he put his victims through?  Why should he get to do these things?  Why does he deserve his own life when he has spent much of it extinguishing the lives of others in the cruelest, most sadistic way fathomable, for his own pleasure. Why does he still have a right to life?

Because spending money to take it away from him achieves no desirable end result whatsoever and only satiate totally nonproductive urge for revenge, which in itself is a damaging indulgence to promote.