Google App Engine suitable for web development companies

Hi guys,

I’ve started a web development company with a colleague of mine and I’ve been looking for a framework that will allow me to run multiple websites off the same base/different datasources. I’ve came across Google App Engine and I’m extremely interested but reading into it and it says 10 applications per developer.

Has anyone had any experience with building client’s websites on Google’s app engine? And is there something I’m missing with 10 application limit?