Yes, but what does "cost" represent?  I've hooked up my wallet, and the amount in the wallet should be shown.  If there's no cost value, the amount is not shown.  But the coins in my wallet don't necessarily have an associated cost.  They just are.  And I want to see the amount, and possibly the exchange rate in another currency.

So I don't understand where "cost" factors in.  Again, sorry if I'm sounding daft, but the concept doesn't click with me.