Think about it.
If the victim of a crime cannot generate any income, does not contribute to the economy or nation building in anyway (such as beggars, homeless, etc), is it really economically wise and practical to render punishment on a crime perpetuator? The criminal may be earning income or even be a Billionaire responsible for helping the lives of thousands other people in employment, punishing these people may hurt the economy and put burden on the state in term of prison management.
IN SHORT: Do you think there should be an alternate approach to sentencing crimes as to focus on how valuable the victim's life is? For example: If a rich or highly educated person was murdered, the penalty should be higher, but if its a beggar it shouldn't matter a whole lot.