I've just been going through, buying some BA, and I noticed something about the cash I get from each battle:
Every single battle, I get either $267, $334, $401, $467, $534, or $601. I noticed that these numbers averaged out to $434, which is about 20 less than what it costs me to buy 1 BA. I figured it might have something to do with my buying, but then I let the next refresh happen, used my 9 BA, and found that I got all the same rewards. Have there always only been six different options for battle rewards and I just didn't notice? And has there always been such a large spread between the options?