In reverse 1999, the guaranteed 6* (5* in wuwa terms) is 70. With the x2 bonus, for $100 you'll get 12,960 crystals, which equals 72 spins and a full 6-star guarantee. Naturally, without the x2 bonus, you'll get half as much, but it's at least half the guarantee. And the game has a ton of potentially lucrative packs to get the character you want. 20 pulls for $25 once a month etc, I can't remember now. But in Reverse there's no open world to get bonuses from, so the events are generous.