One of the best examples is the 4x20 lottery on the Fire Lotto blockchain platform. The jackpot of the 4x20 lottery was won and received by the winners four times already. The moment comes when the next Jackpot will find its owner.
Let's consider 4x20 lottery from a mathematical point of view. The probability of winning the jackpot in the 4x20 lottery is 1: 4845. At the moment, 23758 tickets was sold.
The first important factor is the jackpot in the nearest purchased tickets.
If we take it roughly by the number of tickets sold in the 4x20 lottery, not by the number of unique combinations, then the next jackpot should be in the range of ticket sales of 24,225.
The second important factor is the high Jackpot compared to the cost of the ticket.
If a player goes after Jackpot, then the expected result for the player is 0.003 * 4845 = 14,535ETH, not counting the remaining payments for 2 and 3 guessed numbers. Tomorrow Jackpot will be over 10ETH !!! This event is for 4x20! If the jackpot passes for 14.5ETH, then it can be argued that playing the 4x20 lottery is beneficial for the player: the player pays less for a ticket than he gets in view of the chance for Jackpot 1: 4845.
A 4x20 lottery is mathematically beneficial for a player with a fee of 0.003 ETH ($ 0.6) for a chance to receive, for example, 15ETH ($ 3,000).
Fire Lotto at Crypto Game Conference Minsk, Oct 2018
And of course, we must not forget that the blockchain of the Fire Lotto lottery is built on smart contracts on the Ethereum. So, it gives this characteristics: fair and open game, instant payouts to players, anonymity of the winners.