If people want to gamble then they're welcome to it but a casino game that paid out anywhere near as badly as the state lotteries do would be illegal under the gaming laws in every state that allows casinos.
The state lotteries pay about 60 cents on the dollar and that's heavily skewed by a few huge prizes that mean handing 40% of it right back in taxes.
House edge on table games is in the 3-6 percent range if you play them correctly. Slots are around 10%.
