if by "all the coins you have" you mean your balance there all exchanges have some section called balance or wallet which you can see all the balances and their value in bitcoin and there is always a little text on top telling you your total equivalant balance in bitcoin.
try this link: www.poloniex.com/balances
I think he just wants to see all the coins he currently owns/holds. try ticking "hide zero balances". if you tick that you'll only see coins have some balance, all the other coins will be hidden.try this link: www.poloniex.com/balances
But still I feel they should include this as a separate option on their website where we can see our investments, show the price when we bought them and the current value of them etc.
That is what we all want to see I feel.
You just have to go to the specific coin exchange then scroll down.
You will see your history there whether you buy or sell that coin including it's price. No need to revamp the current interface since it was only you who have some concern like that. You just have to be familiar with the current interface like majority of their users and everything will be fine.
