Come out ahead of what? If the structure is unfit, you get nothing. If the people defend, you get nothing. If the loot fairy is being mean, you get nothing. Anchoring up a new citadel doesnt do anything for you, either, unless you fuel it and add modules.
No, taking down a poco rewards you with the option of putting down your own poco. You get income from taxes from everyone using that poco. You yourself can use that poco with zero tax cost. There is no fuel cost so no upkeep cost.