You don't want to be "less efficient with money" or "make your life worse". Factors like that don't come into it. Neither does "making society better," "reforming the guilty party," or deterrence. And "inflicting more punishment" isn't the goal either -- that's just cruelty.

The basic point is simple. If a person commits a crime, they should be punished in proportion to the crime. Full stop. Within that simple framework, efficiency is fine, but it shouldn't be the goal.