It's not like GMail potential is not already known after all of these
years of running it. So, how much do they spend on it and how much
does it contribute to the bottom line?
The potential of GAE that nobody is mentioning is that at a
comparatively reasonable cost (when compare to say GMail) it keeps
GOOG in that business just in case that down the road they want to be
in that business. I am certain that even they do not know yet how
profitable it could be 5 years down the road until they themselves see
what competition does and even what tweaking of their GAE automation
ends up producing.