LoL $0.4/spin was before my income get hit pretty bad because of Covid and I play mostly medium volatility games. Now I spent $0.1 - $0.38 per spin. FYI $0.4 for high volatility games can crush your balls pretty quick.
I still dislike high volatility games though, but in order to win the contest, you must play it.
Penny slot? Is this type of slot games where you can bet with less than a cent?
Some online slots are penny slots since you can play with $0.01/spin. Nowadays, I think 10 cents should be the minimum bet because of inflation.