Don't forget to put together a bag of Droppable Casino items. The six items are lore, so when you have them on you, you won't waste a Gold Ticket. The items are:
Ton Po's Bo Stick of Understanding
Scimitar of the Mistwalker
Fungus covered Great Staff
Holgresh Elder Beads
Rubicite Breastplate
Vibrating Gauntlets of Infuse
Just pass the bag around to those heading to the Casino. I think they revamped the casino event a bit last month. You used to have to hand in the item over and over again if the RNG picked one of those items that you already had. Now, it seems to give the Dark Elf illusion mask with the first gold ticket you give and then you get the drum with the second. It may still be random, but I just did this with about 8 toons and I got the mask first every time. So count on it taking two gold tickets for every mount you want (if you have your Casino bag of trinkets). The bad part is the gold tickets are lore too, so you may want to place a campfire at the loyalty vendor, or take a bunch of alts to the casino each with a gold ticket.