These sales bonuses were fairly decent considering:

Event Time:
Apr 18th 4 AM - Apr. 24th 12 AM GMT-5

Event Details:
Purchase a total of 500 Koban or more and receive 1 Gold Ticket, 100,000 Coins, 10 Small EXP Cards
Purchase a total of 1,500 Koban or more and receive 5 Gold Tickets, 10 Construction Tickets
Purchase a total of 3,000 Koban or more and receive 5 Platinum Tickets, 1 Mil Coins, 10 Large EXP Cards
Purchase a total of 5,000 Koban or more and receive 1 Soul Ticket, 10 Super EXP Cards
Purchase a total of 10,000 Koban or more and receive 5 Soul Tickets, 5 Mil Coins, 2 EVO Cards

Note:
You can only receive each reward once.
Though it also shows how ridiculous one plat ticket bonus for 13.5k Koban is.

Really sad I missed the launch event by so little and a little surprised they're not doing the same on the new server so shortly after

Upgrade your Castle as fast as you can in the first week of server opening to receive the following rewards:

Lv.10 - Coin x100,000
Lv.15 - Gold Ticket x2
Lv.20 - Platinum Ticket x1
Lv.25 - Coin x500,000
Lv.30 - Koban x500
Lv.35 - Koban x1,000