MOB, not only that, but most of the other multipools (Wafflepool, Clevermining, ScryptGuild) all give very similar payouts, as you can read on other threads. 

Clevermining pool stats as of Aug 21, 2014:


Clevermining is at 166 GHS (they are no small fries).  And look at their profitability.  Just a few percent more than LTC on average over the last month.

So what on earth is ZenPool smoking to get such high payouts?