No rational explanation has been given. I know a warlock inside and out. It's kinda pointless me saying "Hey great suggestion, you must be right" if it is actually incorrect.
This bug/exploit/hack needs to be exposed to ensure it can be removed. Warlocks are already going to be receiving necessary nerfs to bring us into line for WOD. As a life long lock, i would hate to see additional nerfs come WOD cause this bug/exploit/hack is not corrected.
Recently a bug has been exposed that you can have 2 sets of gear, 1 with the required hit you need to be hit capped, and the other without any hit on it.... You can equip 1 set and then the other but not change a trinket and you will retain the extra stats from the gear without hit, it might only be a couple of % extra stats but it is a bug/exploit if used to your advantage (not being an accident).
I am simply hoping to expose this bug in the same way.