Getting Varrock armour will help with the number of battle staffs you can buy from Zarf in Varrock each day. Varrock 1 = 16, Varrock 2 = 32, Varrock 3 = 64. Buy for 7k each and sell on GE for over 8k each. If you stockpile a crafter may give you a very nice trade. Either way it is easy (small) money each day. On a similar vein - Getting your daily limit of sand from Bert in Yanille, and Seaweed and Pineapples from Arnheim in Catherby will over time get you a nice amount of cash. Or stockpile for use yourself later.