You can check on the total raffles ticket and the total allocated on the top header at the site though
Yes it is about luck and cant be altered although I would say that chances are slim with just 1 ticket but still there is some chances
Last month was around 60-70k tickets ( cant remember exactly, so lets get this to the average of 65k ). The chances for you with 1 ticket would be 1/65,000 = 0.00001538 % chance to win
Just for the heads up, it seems to be some minor error for the dice game as it will give you some pop ups error if you try to roll. The dev is fixing it at the moment and should be back up later
P.S : plinko and horse racing arent affected by this