Well slots do have a certain sweet spot. Best example is going landbased casino. You’ll notice that slots in between 4 and 20 euro (max) on avg do better then when going above that. It’s the same online; a majority is low bets; so you’d expect that playing low bets equals better chances then when going high bets. It’s difficult to pound 100 spins at 20 euro each and expect it to land knowing how brutal slots can be.
It all comes down to the following: Being lucky.