I am honestly not sure how much it cost me. I was selling the torstols for 10k each to zulrah killers. You get 3 rannars I believe also from the key which is another 9k. You get another 5-10k more from the other herbs so it helps out the cost of training a huge amount. I think overall I may have spent around 1.5m for 92 mage.
I, once again, have never seen a pker there. It is pretty easy to get away. If you are really scared of getting killed, bring chaos runes for fire blast which will hit zero's on salarin. You could probably x log while having your fire staff auto casting fire blast. Only fire strike can damage salarin.