Look,not trying to rub anyone,BUT......you NEVER keep more than you can lose on ANY exchange,online wallet or anywhere besides YOUR personal wallet on your PC 
This has been common knowledge for YEARS.........sorry some folks lost sizeable amounts but the warnings have been mentioned many times.
I used BTC-E myself for the last 6 months,they allowed ANY amount of eth to be deposited where Polo would only allow a full eth coin deposit....no fractions at all.
But I traded my eth for btc & got out ASAP
I hope BTC-E comes back,cause frankly Polo is the only exchange left that trades eth for btc easily........& I like choices
This has been common knowledge for YEARS.........sorry some folks lost sizeable amounts but the warnings have been mentioned many times.
I used BTC-E myself for the last 6 months,they allowed ANY amount of eth to be deposited where Polo would only allow a full eth coin deposit....no fractions at all.
But I traded my eth for btc & got out ASAP
I hope BTC-E comes back,cause frankly Polo is the only exchange left that trades eth for btc easily........& I like choices