RuneScape has released to the game the ability to calculate the player's wealth, using the wealth evaluator. The wealth evaluator has to be bought in solomon's store, and can only be bought using rune coins.
It is a single-use item; once acquired it has to be activated from the inventory, and it activates use of the wealth evaluator tab. The wealth evaluator tab can then be used unlimited times, but only lasts for two weeks. RuneScape players have to buy another one to extend it another two weeks, up to six months they can extend it to.
A bond will buy enough rune coins to pay for about ten weeks of the wealth evaluator. Therefore, wealth evaluator costs roughly 500k-900k a week, or about 100k a day; assuming the RuneScape player uses a bond to pay for the rune coins that he uses to purchase the wealth evaluator with.
The wealth evaluator counts many item storages, but overlooks several, most notable the player-owned house storage, the smelter in the artisan's workshop, and the kingdom in miscellanea.