Why do players want to increase their faction territory in Factions?

Well, you've all heard of Factions. My question is, what motivates factions to try and increase their territory size? Is there any way to get money for the territory you own, or are there access to mines/wood as you expand your territory or what? Why work so hard to increase your faction territory size if there's nothing in it (except for PVP)?

You should build a base in that territory, which is protected against griefing by the plugin

most common thing I saw with factions on my server was a 3x3 chunks area claimed, in the middle a huge tower surrounded with water and in that building all chests. That's when you own factions

@JWhy I think you misunderstood what I'm asking, I'm asking why would people expand their territories?
@zipron Wait so did the tower have treasures for factions to capture? What stopped people from just swimming in, and stealing it without owning the territory where the tower is?

Factions prevents user from building/using chests in foreign territory

It is smart to have mutch land and a big fachion