If you are an ironman without a black mask, you should not skip these. The black mask is one of the most useful items to have in OSRS. They also drop quite some herbs that are useful to train herblore with later on in the game. The rest of the drops aren't good enough to make it worth it to go out of your way doing them. If you are a normal account, and you are not short on cash, and you have bought a black mask, then I would not do the cabin fever quest, so you do not have to kill them. They are pretty slow exp and are far away. If you kill them with a cannon, however, they are alright experienced, but you won't make much - if any - money killing them unless you get a black mask drop.  In conclusion, I would only kill these and not skip the task if you do not have a black mask already. If you have, these aren't much fun to kill and the experience you get an hour killing them is not that good. If you want to do the task but still have to, or you don't want to lose slayer points because you skipped them, bring a cannon and use the attacking method praying melee.