Well that was easy.
I've managed to reach level 100 (the highest level) in Cash Frenzy Casino's Season 14 Free Mission Pass with 7 days left to spare (as of September 16, 2020).
My final reward added $38 billion to my account. This is a hefty amount of coins considering they're currently charging my status $99.99 for $50.4 billion coins.
Because I reached level 100 in their Free Mission Pass -- I could immediately unlock all 100 levels of their [Paid] Mission Pass for only $4.99! This will add at least $316 billion coins to my account! Here's a breakdown of how I'll receive these coins:
$172 billion from my Mission Pass rewards.
At least $129 billion after my second diamond expires in the Diamond Lounge.
At least $15 billion from my Mission Chest after the season ends.
In addition to these coins, my Emerald stash has increased by 4,640. This will come in handy whenever I want to bypass a level up mission that takes way too long to complete.
Disclaimer: As of this writing I'm not affiliated or sponsored by Cash Frenzy Casino. My estimated experience does not represent what you may experience in this game.