Wow, that's rough. I noticed on my brief foray into AppEngine that it is really easy to run up against their CPU limitations (as in, four trivial queries on a single pageload will do it), but it's amazing that you've managed to run up a $1,000/mo bill with them.
Or are you really burning through SQS requests fast enough to make it cost cash money?
Either way, it sounds like you've painted yourself into a corner it will be hard to get out of. AppEngine is probably the most difficult platform imaginable in terms of how hard it is to migrate off of. You'll have a ton of work to do just to get out of BigTable, and then you're left with a Django app.
I guess the best you can do is start charging money, and start developing a new version as quickly as possible to stop the bleeding.
Or are you really burning through SQS requests fast enough to make it cost cash money?
Either way, it sounds like you've painted yourself into a corner it will be hard to get out of. AppEngine is probably the most difficult platform imaginable in terms of how hard it is to migrate off of. You'll have a ton of work to do just to get out of BigTable, and then you're left with a Django app.
I guess the best you can do is start charging money, and start developing a new version as quickly as possible to stop the bleeding.
Good luck!