How could someone manipulate the price so easily? This could be due to the reduced market interest in the NMX token, more good news is needed to raise the price.
You are correct. And new people could get confused as they don't know how to read the orderbook action to see that most of nmx/usd trades there the trades are faked volume. So they see volume as a market interest. Fake volume is kinda frustating but not at all unusual on exchanges that don't have enough liquidity as they need to attract people.
Why is the Nominex team not so active in adding new tokens to their exchange? wouldn't adding new tokens in the exchange attract new traders and increase users and trading volume?
This is because they are waiting for the binance broker program to kick in (it should have started already), where they get all the binance pairs they want instantly.