Actually, the cost of death row inmates is significantly higher than regular inmates, and when you factor in legal costs (because cases which seek the death pentalty always require extremely high levels of judicial oversight, review and numerous appeals), the average cost of an individual sentenced to the death pentalty is A LOT more than an individual sentenced to life in prison.For an example, you want me to pay extra taxes to house convicted murderers for years and years, instead of executing them and reducing the tax burden.
So, your argument actually works in reverse. Why should we pay more money just because you want the state to kill people?
But, even if this were not so, please think carefully about your argument. You are literally saying that you'd rather people were killed, if it saved you a small amount of money.
I wonder what Jesus would have said about that?