The Rules are the same as the site rules. Here are the tips.

-The stable rate for Gil to Tickets is 100 Gil for 1 Ticket.
-This rate might change, all depending on how many people want them. So be watchful for rises and decreases of this rate.
-Investing in Tickets is the only way to get certain items and things, but you need your Gil as well.
-It's a gamble pretty much, have fun with it!