This is a huge problem although poloniex probably won't care.
They are earning a ton of profits from people trading on their platform and paying that around 0.2% fee per trade conducted. They couldn't care less about small players in the system that contribute next to nothing to their profits.
Also by using their site i'm pretty sure in the ToS they state that they are not liable for any losses and the software is provided "as is".
Anyways, if you don't want to trade on their site because of this, then don't. There are alternatives for that. Like Bittrex.
To be fair,
I'm pretty sure that all exchanges are going to avoid being liable for any losses. However, that doesn't make it acceptable for them to be responsible for these. They are a very major exchange and if they're taking fees of ~0.2% they should definitely be able to handle their servers and keep the exchange operational. If we find that the problems are purely because of their profiteering, it'll be time to move to another exchange that takes their responsibilities more seriously.