Ray - you're absolutely right, but i think that every exchange has to be supported. What will happen if cryptsy and comkort will skip trading with Zeitcoin?!?!?
Bter is a very important target for Zeitcoin but don't forget the other.
I think the more exchanges (of a reasonable volume) ZEIT is traded on the better, as it directly translates on the popularity of the coin, and for example, on the willingness of people to develop the services/apps for the coin. Now, we shouldn't forget about the risks of being on the big exchanges where the price can be often manipulated by PnD groups, there are trading bots, etc.