I have a feeling that we will be seeing alot of these "Win A lambo", or "Win a Ferarri", or "Win a LandRover" threads in the next coming few weeks due to the huge popularlity that this thread has created. Basically it will be similar to the Bitcoin forked coins right after Bitcoin Cash proved to be a huge success.
And the problem will be that most of these will be scams, even though they can easily be legit if it ends up being run on a smart contract where the code can be inspected and then the company/person holding the contest can make easy %'s of the entire proceeds and all they would need to do is buy the car and deliver it to the winner. Not rocket science.
However these raffle are easily going to be turning into scams since people just want to make a quick BTC and disappear with the funds.
It will happen in the future or maybe in the next days, weeks, or months people qill attracting when reading a "winning a Lamborghini" like this one it has a good sales and odd compare to some lottery site, but the worst scenario like what you said its easy to scam or cheating in a game.
As of this moment, there are 2 threads holding their lambo lottery. Will be interesting how they will end up to? The other one has progress bar showing the percentage of tickets sold. But the authenticity is questionable. No transactions just progress bar. People should accept the fact that if they send money to these sites, there should be no regrets or cursing that they were cheated. They should know what they are getting into in the first place.