Even whales in Vegas do not bet that much higher than these amounts, we are talking about 100k+ bets on each hand, if there is a whale in Vegas that bets millions of dollars even that dude doesn't bet 100k per bet or maybe they bet that much only.
Do not mistake the total combined wagered amount and the per bet amount, per bet amount of 100k is basically the max you will see in anywhere around the world, there are really rarely anyone who bets more than 100k per bet in anywhere in the world including Las Vegas, all those huge whales that play tens of millions of dollars usually bet 50-100k at most and their combined losses comes to millions of dollars at the end, not millions of dollars per bet because that is really not something that happens that frequently, only maybe handful of people are that rich to do that.
That is not true. I don't know if you remember but there was a MTV show called "Buried Life" and basically they had a list of stuff to do before they died and one of them was to make a million dollars. So they went down to Las Vegas with like $125,000 and were going to bet it 3 times to make it into a million. And they bet the $125,000 and won and then they took the $250,000 and bet it and lost. So the largest bet was $250,000.
There are probably other games like Poker where the pot is many times in the 6 figures, especially on the televised poker challenges. And if I recall there were some which might of been in the $1 million dollar ranges also.
Since each roll is independant of the prior, rolling more doesn't really create an advantage statistically, hence sometimes you might as well risk it all on one roll and save yourself time.