regarding cleos coins... the way i have always seen the
free spins is if you get 10, on at bet at that bet value on a bad day it will pay $5 or so at least, if you hit 20 on a bad day it should be $10+ (and a chance of hitting the coins bonus which pays 3x)
To me I see that as an impossible chance for it to play like that. Its just awful... I would contact the
casino and maybe they will at least give you a free chip.
Its weird how all rivals seem to pay different, like earlier I mentioned I deposited $30 to slotto cash, took the 100% bonus, bet on cleos coins and
atomic age, 45c a spin. It was a complete ripoff, the only bonus round I got was cleos coins and the coin picks only paid $1.80... never will I play there again, but I will take their free chips

...
Then I went off to
21grand, deposited $50, same bets, same games, 1st hit free spins on cleos for $5, then coin bonus for another $5 (thereabouts), n finally went to atomic age, hit the car bonus for over $20. Cashed out after

... with a $4 overall profit for the day.
The thing with
rival slots like cleos coins is they dont tend to pay nothing on spins, and then a nice sum out of nowhere, since the varience is very low/low you either get what you put in or lose. For example if someone was betting 20c a spin, you wont win anything more than $50 even on a very good day with a single win, so its like each bet value has a maximum and minimum payout limit for a bonus.
I would understand it with thoese higher varience like psychadelic 60's because other factors come into play where you can get expanding wilds (once i was playing it, 40c a spin, hit 3 stacked wilds on free spins and it paid out $500) so thoese machines are the 1's that you can lose for ages on and think its being tight but then hit something out of nowhere