The cost is going to be decided by the average price at GE, even for items with fluctuating prices. The general value will vary only when the RS gold cost of an item increases by a very large percent [for example....rise of granite or water talisman] And to save time adding them up, another bar below the previous one mentioned will demonstrate the total value you have. Once more the cost is decided as previously.
It will be helpful if you want to purchase something and want to market some of your things, but dont know what to. And so you don't need to spend time for price checks [or calculating the price] or hunt the GE database[or the GE itself] Personally I think its a very useful suggestion. Ive always wanted to know how much cash I have as a TOTAL. And im sure this would benefit us all. If a topic mentioning this had already been made... forgive me. For cheap RuneScape gold I didnt know of it. So far as I understand....this thought jus dropped upon my thoughts.