Recently, a lot of the insurgency servers have disabled the PvP slots all together.
The defending team, the Takistan insurgency, is under-equipped and out-gunned in such a terrible manner I do not see why anyone wouldn't run Insurgency with a 1:1 ratio - there is no risk of "losing" as there are no winning conditions for the insurgents.
I would rather see a full 1:1 PvP server surge. Fighting against humans is a helluva lot more challenging than the AI, but perhaps that's the problem? Someone enlighten me, I cannot see where there are only 4 PvP slots in vanilla Insurgency.