Permanent Pack Guidance Ticket

Weekly 6000 yen for 16 tickets + 2 days of red orbs Monthly 6000 yen for 12 tickets + 27 R cards Let's skip the red orbs and compare 4 tickets vs 27 R cards. 4 tickets = 2000 diamonds 27 R cards, calculated as letter gifts, are 9 sets (5940 diamonds). So, the monthly pack is 3940 diamonds more profitable. However, the story changes when considering boss tickets and tower tickets. 9 letter gifts give 72 tickets (36 each). It's hard to measure the value of boss and tower tickets, but if converted to regular shop prices, it's 7200 diamonds. This makes the letter gifts 3260 diamonds more profitable. ...But the main point of letter gifts is the 3 R cards, the tickets are just a bonus. Is it worth paying 660 diamonds for 8 tickets... it's debatable (I want the boss tickets for Adamant and Water though...) In the first place, do people who buy the permanent guidance pack already have a lot of tickets? If so, considering the value of 8 tickets is quite low when buying the permanent guidance pack... does the monthly pack become 3940 diamonds more profitable again? Or, since I don't know when I'll stop buying letter gifts, is the weekly pack better in the short term?