Это система заказов, хоть и старая но прикольная, в ней нет эксплоитов.

Официальное описание с Gmodstore


THE ADDON SHOWS THE PLAYER MODEL NOW, NOT STEAM PROFILE.
Description:
This hitman system has a unique way of retrieving hits on players.
Features:

• Extremely customizable config.
• Stack money (If there is a hit on that player, it will then add more money to that hit.)
• Minimum/Maximum hit price amount.
• Easily save hitman npc’s on the server using "!savehitman" or "/savehitman" and unsave using "!unsavehitman" or "/unsavehitman".
• Chat notifications.
• And more!

How the addon works:

1. Setting a hit.

• Walk up to the hitman NPC and select a player to set a hit on.

1. Retrieving the hit list.

• Walk up the the hitman NPC and press your use key.
• The hitman NPC will give you the current hit list.

NOTICE:

• All hitmen can have the same hit list. That way the hitmen would have to compete with each other.
• The hitmen can also have different hits, meaning the hitmen would have to keep checking in with the NPC to receive the new hit list. (The hitmen are notified that there is a new hit list.)

pLogs Support

• Create a new file in "plogshooks" called "qfhitman".
• Paste this code in the file. http://pastebin.com/R9xZVeMx
• Add this line "['qf_hitman'] = false," into "plogs.cfg.LogTypes" without quotes.

Hooks
hook.Add("qf_onHitAccepted","Hook1",function(target,customer,price)
end)
hook.Add("qf_onHitFailed","Hook2",function(target, reason)
end)
hook.Add("qf_onHitCompleted","Hook3",function(hitman,target,price)
end)