Pretty sure that it is possible to hit 1000B gold. But you will need LOTS of luck)
Btw i played only on hard, screenshots in my previous post done on hard mode as well.
Game with 728b is not ended yet, i'll post Sat's dmg here.
Finally ended 728b game
Sat equipped with 2 Blades of Darkness and 2 Dried Cactuses.
OMG. How lucky can one be ? Ive tried it like 15 times now. On wave 150 i quit, because i only have 5-6 money bins maximum and like 100k gold...
That's a good SAT :) Just finish my first playthrough, it takes a lot of time to go through 2000 levels!! I'm almost considering suggesting that the dark forge can make scepters! Gonna try hit 500b later on hard this time.. but yeah, guess it depends a little on when the bins drop since you can only start with 1!