I happened to like this gacha game. Welp!!!
The number might seem really random, but, in a past stream, Kidani had actually mentioned why the new starter decks are worth 333 yen. Apparently, after much deliberation for the new cards that would mark the inception of Vanguard's 10th anniversary, he wanted to send a message to the people who have been helping to support the game thus far. To this extent, there's also a reason as to why the starter decks come in two batches (first three and then two) as opposed to distributing all five at the same time.
In Japanese, the word for "three" is "san" and "nine" is "kyuu". Being that each starter deck is worth 333 yen, and, taking into consideration that the first distribution will be composed of three decks, that equates to 333￥, 333￥, 333￥ - the number 3 appears 9 times, or "san kyuu", which, in Japanese, is one way of saying "thank you".
Pretty creative and kind of funny and cute, haha.
Meanwhile, Saya Iida's base monthly salary is 150k yen (~$1500), of which 40k yen is spent on gym memberships
March is gonna be one expensive month.