OpenTable - Business Model

When I dine, I try to reserve through OpenTable because OpenTable gives diners points through its loyalty rewards.  But how does OpenTable make money?

Revenue Sources:
   1. OpenTable charges the restaurant a Enterprise Resource Planning (ERP - a software platform and proprietary hardware) a setup and training fee (5 % of revenue)
   2. OpenTable charges the restaurant a monthly subscription fee (54% of revenue)
   3. OpenTable receives a fee from the restaurant for "guests-seated" (41% of revenue)

What Do They Provide:
   1. increase the restaurants presence via
   2. email marketing
   3. web & mobile presence for restaurants
   4. online reservation for diners (don't need to go through the restaurant phone and when closed)

Income Statement (Dec 31, 2010)

 Revenue   : $98.9M
COG        : $40.1M
--------------------
Gross        : $58.8M

SGA, RD : $40.9M 

--------------------
Op Inc      :  $17.9M

 Int, Tax    :   $4.1M

--------------------
Net Inc : $14.1M