For example, buy an alt-coin at price X or one exchange and sell it at price Y on another?
I have no experience as I've only ever used Poloniex. As a variation, I've foolishly bought some very thinly traded coins e.g. CNMT and am wondering if they is a way to dispose of them outside of Poloniex (where there are very few buy orders).
Any suggestions / ideas / thoughts?
Unfortunately no.
Wait, maybe even rise in price.