I'm not talking about when someone blocks off the end of a tunnel that leads nowhere, i'm talking about when someone (or a group of people) create a 'mega' base where it's all the bases in an area, and they block off the entrances. For example, in the screenshots that are below, a group of people have cordoned off the area that has the amphetamine buyer which basically makes an amphetamine cook useless because he can't raid. It makes the cookers who are not in that base useless because they have no good way of selling his product
http://steamcommunity.com/sharedfiles/filedetails/?id=575301351
http://steamcommunity.com/sharedfiles/filedetails/?id=575301040