I think that you've started it wrong.
The raffle is not crypto related. The price is also not crypto related. Just crypto is also accepted.
One ticket is 2 EUR, no matter how big or small Bitcoin is. That .00056 is already incorrect. The target is 900k EURO, not 1.2M. And so on...
The logic is, on the other hand, correct. They will indeed keep quite some money for themselves. This happens with all lotteries actually.
This is not surprising for lottery-operated business. Sometimes they can rake a lot of money if their contest will be a hit. If they will sell the tickets slow or not reaching their min target entries, we might never see this lambo. The realization of this raffle depends on the money that will be raised.
Lottery system is very difficult to win as so many people tries their luck in it and only a few can win. I am really not fond of lottery as I think it is almost impossible to win when there are already so many contestants.