To unlock the VIP tickets you have bet a cumulative total of Zack Dollars in the casino while in Owner Mode. Win or lose, once the amount is reached the ticket will be unlocked for purchase at the start of the next day.

Unlockable	How to unlock
Dangerous Ticket	1,000,000 Zack Dollars.
Forbidden Ticket	5,000,000 Zack Dollars.
Secret Ticket	10,000,000 Zack Dollars.
Tempting Ticket	2,000,000 Zack Dollars.