I was contracted once.
To disobey was to PK
The PK thing kept people in line. If you disobeyed your 'master', you pk. That was the overwhelming threat to keep you from betraying your masters.
It hurts me to say this, but something is needed to keep people in line. Lets say that this is revived -and you remove PK (as you stated in the comments above, I believe.) ; what are you going to use to keep people in line from obeying the contract terms?