If you believe the ticket.db only has one game on it at a time then you are sorely mistaken. Either that or @Ptrk25 is performing some arcane magic to make your ticket.db that "only has one game on it" show all the games you've ever installed, using Groovy CIAA ticket can only contain data for one title. Also, there's still no way to get titlekeys for arbitrary titles.
Or you'll have to wait at least until someone makes use of the DeleteTicket am command.