I've just bought some ZEIT on YoBit because of the low price and I like the idea/community.
However, got a bit concerned since coinmarketcap doesn't list YoBit as a ZEIT exchange. Did I just buy somebody's rip off fake coin?
No such thing as fake Zeitcoins on any exchange. The best thing you can do is sell the Zeit for LTC/Doge/BTC, transfer those to a different exchange that has a Zeit pairing (look on the first page of this thread) and then withdraw to your wallet. The final step is NEVER USE YOBIT AGAIN!