I am with MinesomeMC on this one
A proper raiding alliance does not need any papers/treaties, they just reduce the amount of targets a raiding alliance has. What they truly need is a proper banking system/offshore, if raiders can't be 100% sure that their loot is safe they will leave.
For raiders AA wars are just another day, after all we deal with counters on daily basics. Even if you are outnumbered and outgunned a good raider will continue making profit, have positive net damage. Can't even recall the last time I actually needed to use my savings to continue fighting.
I guess it could be argued that a "protector" provides a reliable banking services that are essential to a raiding AA but I would argue that even a micro/nano raiding AA should always look into ways to make sure that they have full control over their banking.
Then there is always a chance that those papers will drag your ass into unnecessary AA wars, can cause some FA headaches for you and the "protector".
Over all those treaties just end up being a massive bee sting to your behind down the line.
TL;DR