These things aren't really working out terribly well for the manipulators. There's not as much panic selling as their sub-market dump needs in order to turn a profit. (All they're really doing is relinquishing their market position.) It's pretty disorganized as well.
This is a good thing to put in there. Crypto-currencies are prey to all the manipulations of exchanges 100 years ago. Ya, that's what happens when you create unregulated virtual gold. A trader explains it here: https://news.ycombinator.com/item?id=3787375
It's also going to be much harder once the currency has any sort of significant financial value. This kind of manipulation is only easily possible at the early stages.
I continuously trade DOGE into BTC. Since starting a little over 4 weeks ago, I've made a significant amount of BTC via DOGE. I'm about 1/2 way through paying off my rigs, give or take. I also missed out by not holding DOGE before the massive run up, but I'm cool with that.
https://news.ycombinator.com/item?id=7126153