You don't actually think they target people with expensive armour or certain stats do you? -.- It has to do with the rev level, and your own combat level.
Slayer, and you can do that without starting any quests, and just because its a members skill who cares, you might as well start training now, then at 95 melees. Any other thing is probably ankous, or cockroach soldiers.
I remember seeing a pic on the forums showing someone who had both and trimmed and untrimmed mage cape, I'm sure it was possible before, but not anymore. Would be cool though.
For your levels they're decent, but you would be better off training slayer until you get your melees around 80/85, then camp at fiends for the crimssons.
Just buy salmon for food, get atleast 2k tokens, its not going to happen in like 30 minutes. It going to take some time, what other choice do you have for a shield slot which is as good? Nothing.
Use your skills to your advantage, try either mining or fishing monks ( if you have finished the quest swan song). Use the money to further train skils such as your prayer, range, and summoning, don't blow it on dragon.