Stronghold Camping?

[Crashlander04]

Lately, me and a few others were wondering about the rules surrounding the claiming of a stronghold as a nation.

A group of players, who shall remain nameless, [apparently] constantly go through their local [within 50 or so blocks of their town] stronghold in large groups and are fuelling their own nation solely with a supply of overpowered loot.

Considering the odds are pretty good to find diamond armour and tools inside a stronghold, this is looking pretty unfair to those who can't enter the territory without a death threat (everybody not in that certain nation).

Any clarification on the use of strongholds like such would be appreciated.