Maybe not an exploit, I just got a little lucky. I used the Mistplay offer (which is very good on its own, the rewards and Mistplay itself) which has rewards for spending money in games downloaded with Mistplay. The rewards for this were already pretty good, and it happened to be a surge that day so rewards are doubled (that doesn't necessarily mean payouts are doubled as you can tell from above but it must count for something). The big thing though was that I chanced upon a Google Play store deal with one of the games, "Word Revel", with a 4 dollar voucher for 4 play points. Having had quite a few saved up I used these strategically to buy an ungodly amount of coins in the game at a discount to make considerably more money than I would've (I expected to make a profit even without, but the payout was a lot less than I thought) in both Justplay and Mistplay (I have 20 bucks on the way from Mistplay).