Look you idiot, tell me all parameters that he used and I will check.

But if you bet on payout 3968
And roll under 0.3

You don't make any profit at all in 100 million bets. But if I am missing a parameter that you didn't tell me then it's a different story.

Taking the most extremely wrong one:

0.02% chance of 6613x

That's a 0.0002 chance of a profit of 6612, and a (1-0.0002) chance of a profit of -1

Or:  0.0002 * 6612 + (1-0.002)*-1 = 0.3244

...a players advantage of 32.44%