btw, not sure how many of you have prime--but the prime day deal lets you double dip discounts. Right now 100.00 of Amazon coins is discounted for 21% off. But then Amazon has a special in game where Lapis is 25% off.
So you can buy 100 dollars worth of coins for 79 dollars. But then only spend 7500 coins (75 dollars worth before the discount) to get the largest Lapis purchase. However, the Ex points you get from it count for the full price, not the discount, which bumps up the value if you use that value equation for packages that's on Reddit.
Any case, it turns it from 1 dollar per 180 Lapis, to 1 dollar per 303 Lapis for the Vault. By comparison the Fountain of Lapis is 1 per 793. Without including the Ex points, this gives it a 168% increased value, before the Ex tickets are factored in and not factoring in the fact that the discount on Amazon Coins can apply to other packs as well. (Only a 133% value pre-ex tickets if you inflate the value of everything else due to coin discount.) But not factoring that, its about as good a deal as a decent bundle, like the new years bundle, but doesn't touch the really amazing deals like Vault or that 10+1/5star bundle.