Is it possible to use hundreds of Android devices with the same google account? We have developed a App that uses GCM push, that seems that needs Google Play Services (Google account).

Customer has 100-200 devices, it it possible to use the same google account in all devices? Gmail will be inactivated, and buy apps to Market will be disallowed.

Aditional info: We have proposed Google for Work, but Customer is not interested at this moment
Did a quick google search, seems like there is no limit placed devices connected to your Google account. The only apparent restriction is four devices for Google Music. 

Aside from a bug, there no documented device restrictions.