Well, it seems that there are a fair amount of the "mathematically challenged"
here in the
CM forum.
And as much as I've dissed 3Dice on these pages, I have to say that Enzo indeed has the truth on his side on this topic.
So, allow me to make it simple to understand the difference between high and low variance. I'll use the lottery to make it clear:
- "Lotto" type games are an example with high variance payouts. A ticket usually costs just a dollar, but the payout can be huge. The chance of winning the big payout, however, is very small.
- "Scratch Cards" are an example with low variance payouts. Tickets also usually cost just a dollar, but most of the "winners" are small, just a dollar or two, or even a free ticklet, and even the largest prize falls far short of the top prize compared to the Lotto game.
Now, imagine that a casino has both a high and low variance slot, both set at say, a 95% return. Since more cash is returned to more players more often on the low variance slot (hence, "more playtime"), there will be more bets made (playthrough) on the low variance slot.
Since the casino pockets, on average, 5 cents on every dollar played, the low variance slot will actually produce more profit for the casino, as the players re-play their winnings.
I hope this clears it up

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