They are mining BTC in GHash and BTC Guild's pool being paid out on every found block in their pools proportionately to their hashing power, which having the Ph/s that those pools have they are spewing out blocks. (Sneak peak of MELY =D)
Having 100 Th/s in their own pool yields a block find approx. every 8 days 14 hours at current difficulty, which varies depending on luck.
On the other hand having 200 Th/s seems for feasible with finding a block cutting that time in half to 4 days 7 hours.
I would say they are waiting for their other 100 servers to arrive to have a bigger pool which will in turn give them more exposure and likelihood of other miners joining their pool.
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