I guess that depends on your luck and your tactic. You can always play dice with 95% odds of winning for just "mining" the bfg tokens. Then on the other hand if you play games like plinko or keno, there's a change that you get very lucky before you eventually lose. So you will get way more. With slots it's cheaper to mine but luck is even bigger factor.

Here's the current mining price before it gets more expensive again: