It was mainly during the esports period in the pandemic where I gambled on some esports and football and NBA wasn't around which I normally mainly play. I never really knew what the minimum was during the regular season because I was gambling over 10k all the time anyway, it was more like 0.01 eth fixed in most cases unless there is a rare situation where I wouldn't want to bet that much, whenever I went something other than 0.01 eth it was usually higher and not lower, so never really tested the minimum before.
But during this pandemic since there wasn't much to gamble on, I checked esports and since I didn't know the teams that well I usually just gambled the minimum allowed and in those esports games it was changing radically, from very very little to as high as 5k if I do not remember wrong.
Also do not forget that not everyone really gambles for the rewards neither. There was a guy who wagered over 150 bitcoins for a reward of 500 bucks or something months ago, and he said he didn't gambled to win, he was just gambling like he always does and he ended up gambling at the same moment the competition was going on so he happened to win.
There are tons of whales on stake because it is one of the oldest casinos out there, do not look at their own date only, primedice and stake are partners and primedice is one of the first places to open in crypto gambling space, so they have a ton of early bird whales in the casino gambling here.
This example could be wrong, 1.5k reward with just 16.75 is not really that bad, he gambled around 152k and the reward is 1.5 which is right around the 1% mark.