Never mind. I've just got lucky! I went into superwin mode, making 1 x500 and 2 x50 (777. Also I've got the fragment). Got 12000 coin profit with the trophy popping up. Good. I should have enough coins for the chaos crystal and odin weapons I suppose!
NOW I wish this could happen in real life!!
EDIT: I don't know if it matters, but I first spoke with the girl and she said that "the machine was on fire!!". I played about 650 coins that I had and lost all of them. Reloaded, exchanged the casino tickets and in half an hour I started the jackpots.