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.

They'd better hurry then, since all the coins will be mined soon

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.