Im investing a part into poloniex, at lending service, and sometimes into some altcoins a small ammounts, the other part im paying to get my projects live soon as possible.
Saving a lot of money in a exchange like Poloniex could be quite dangerous. It is better to save in your own wallet.
true specially on what happened with Gox and bitfinex (the latest) getting hacked that is why i never stored my coins in an online wallet or on exchanges. i love the security of bitcoin that is why i want to be safe on my end.