It's true when you win you will be a rich man, but chances are so low that for me it is waste of time. Dice, blackjack, poker, almost every casino game has better odds.
Desperate people vying for a last chance.
Well that's debatable, first of all in euro millions you have the chance to win, as of right now, 15 million euros, the last jackpot was 40m. for the cost of 10-20€ with a 1 in 116 million chances. The chances are really slim but remember you can win a lot for a somewhat small cost.
In a dice game without house edge(0%) you would need to set the chance to win to 0.000067%~ to get 15 millions with a starting bet of 10, 0.000067 is 1 in 1.49 millions, far better odds than any lottery BUT you will never be able to do that since most sites have their min odds set to 1% and i saw even 0.1% but not 0.000067%
I didn't even calculate the percentage chance, but now that you say it that way the people must be REALLY desperate.