A game with a large payout also has a high traffic of gamblers.
This is always a marketing strategy.
In local sweepstakes or lottery, TVs, radios, news paper will always cover for this in entertainment section, telling that "no one still get the jackpot price, it always grow day by day" that's why many people will try their luck due to low risks with much price but witlh lower chance of winning.
On the digital world, a casino that has lots of promotions, lower house edge, lots of games always be the one who have lots of users while the risks will still the same, just depends on the games house edge and etc.
It is precisely because of this that lotteries are so popular, the possible win is so big and the cost of participating so low that people love this idea of earning a lot of money for almost no cost, however we must remember that even lotteries are a gambling game and there have been many cases of people becoming addicted to them and losing all their money, so like always caution must be exercised and people should still gamble responsibly even when the perceived risk seems to be on the low side.