There is a couple problems with this:
-You are ignoring the lengthly appeal process.
I'm not ignoring it and I certainly don't endorse it. A court system should not be so entrenched is bureaucratic tomfoolery. Even with the appeals process, the death penalty is typically cheaper than a life without parole sentence. Furthermore, I think it is morally objectionable to sentence a person to waste years of their life in a cell compared to outright shooting them in the head.
-Society is more than dollars n bitcoins
Is it? How do you measure your worth, then? Because I'm betting whoever you work for measures it in money.