Demanding tribute: frequency and repercussions

The game: Caveman 3.0 - a stone age FPSRPG.

I'm adding the ability to demand tribute from other bands of cavemen. How often should the player be able to do this? Or more precisely, how often should the band have tribute to give? Once a week? Longer?

What about repercussions? The action will nuke relations with the band. Do it to every band around, and nobody will trade with you. But should other bands gang up to take you out?

The feature was originally part of "goals for bands", which didn't make the cut, but included bands ganging up on you for trying to shake them down.