It's all a huge inter-woven complex.

You could say that the prisoners pay indirectly back for what crime they have been convicted. And so they are worth more alive than dead.

Haaaaah! I didn't think of it from this perspective.
Makes sense and opens up debate demanding deeper insights.

Do you actually have the death penalty in your country?

It's tricky. They lift it whenever they want and impose it whenever they want.

In 2008 executions were halted. In 2014 they lifted the ban.
Nevertheless, there aren't many cases where the criminals were executed.

Well, in a corrupt system like ours the corporal punishment is highly susceptible to be misused. From top to bottom all the sectors are corrupt. Justice system is among the toppers.