I dont know why i should not keep my coins in exchanger if i am carefully then i think that nobody cant stole my money from my wallet so i keep my money in exchanger really long time and it is still there in exchanger.
well i guess you didnt learn about the bitfinex hack, it should be never done because no one knows what might happen
By now most of us now that exchanges can't be the way to store coins. Minor exchanges are dangerous to scams of altcoins and even BTC lost.
The other exchanges; bitstamp, bitfinex can or will be hacked making your bitcoins just gone. Without any reason. So if you care about your money, you don't store your coins there.