Please keep the requests to add XEM to margin trading and lending coming into Poloniex. Use this form--it only takes 30 seconds:
https://poloniex.com/featureRequestLending will provide another way to fairly safely accumulate XEM. Or... if you're good at margin trading, then you can make some big profits with it.
I don't personally think that margin trading helps a coin's development at all.
margin trading brings volatility, which is bad for using nem for it's value for development (for ex. the comming Foundation)
Im sorry guys but good for trading is not good for nem.