Just my two cents, but what's the worry?
As it is, you can have 3 apps with 5 million page hits a month PER
account, and you can have as many accounts as you want... is that too
little?
If you start going over that amount of page hits, the idea is that the
ad revenue will more than pay for the service. Believe me, Google
wants us all to succeed, because that helps Google; that's why they
started the App Engine.
I think most people underestimate how hard it is to drive such massive
traffic to a website... 7000 hits per hour!
People all over the world are working night and day to come up with
the next Facebook, however, few have grasped the concept of many less
visitors, with those users being very dedicated customers who use an
essential service the site provides, a la 'backpack', 'campfire', etc
from 37signals.
I realize that without some form of payment (either through ad revenue
or subscription), nothing can survive, but that's the challenge of
business.
Otherwise, be happy to have a live Internet presence for zero dollars,
as I am!
http://archi-checker.appspot.com
... and yes, it's a learning/hobby platform for me right now.