I have no idea, you can flip on the market but truly I've just been really lucky with pulling diamond cards. But I'm kinda low right now. If I went through and sold all my silvers though if probably end up with like 25-30k
But I also put in a total of $150 of my own money plus a $50 psn credit I got so basically $200 into the game which I wouldn't recommend. I just wanted to get chipper and also if I hadn't pulled Harper twice I probably would've had to spend another $150 to get him which just isn't worth it
Actually really it's not worth it to put any money in this game. It's possible to get everything without spending a dime. You just have to have a lot of time on your hands
Also BR is about luck as well. A lot of people never get any good rewards until 10-12 wins in and then some get rookie FBs after 2 wins. So...I can't honestly say BR is the best bet to make easy stubs