Always, and some of them make zero sense to me. For example, in Fallout 4, if you side with the Brotherhood of Steel, Proctor Teagan will have you get resources from settlements by "any means necessary", including extortion. You can, conceivably, pass a speech check and buy them from the settlements, but, if I'm already the General of the Minutemen, and already have settlements established, why can't I just set up a supply line to the Boston Airport, and provide the resources that way?
