The issues all come down to Dgex, which is the only exchange for Nxt and the only source for coinmarketcap stats. The site is often unavailable (ddos attacks) and subject to manipulation, furthermore, they've implemented outrageous fees causing many to shy away from trading.
Which is why we should move some trading over to Peercover. Not all trading, but some of it, just to test the waters. There aren't any fees and you don't even have to deal with XRP save for the reserve which comes down to less than a dollar's worth. Don't know why people are still hesitant to move over there.