In this world, there is no absolute lawlessness! Even useless order is better than no order at all! There is a type of people who don't care about this! They may be doing it for money, for games, for pure purpose - they are killers!
What if someone wants to kill someone but can't do it himself? Then find a killer, and you only need to spend a little money to fulfill your wish!
If someone is on the way to the top, kill this guy who is in the way! You can pay to find a killer.
If someone wants to seek justice, they are unable to do so! You don't even have to pay to find a killer, as long as the person is as just as you are!
A bit interesting