Teardown.com has taken apart the recent mostly talked Google Glass product to estimate the components' cost.They found that the priced US$1,500 Google Glass only has components worth US$79.78 inside it, including assembly and testing. The breakdown is shown below.
Of course, the cost mentioned above hasn't included engineering design costs, initial start up manufacturing costs. So, definitely the raw cost will be higher than US$79.78. Not mentioning about licensing fees of intellectual property right for technologies which Google might have used in the device from thirty party.
So, the chances are unlikely that the company is getting rich on sales of Google Glass. However, if sales hit the range of millions within the next couple of years, good chunk of Google's revenue might flow from selling this device.