So there's a new sale on, and I'm getting to the endgame girls I guess (had Maggie, and just did a reset to gain +50%).

However, my multiplier is a bit weird, it's currently at 65.54k bonus. So I can only purchase a 2x or 2.75 multiplier due to the limit being 180k atm, but the 2.75x multiplier seems like it's costed as if it's a 4x multiplier (87 vs 163 diamonds in the current sale).
Does anyone know if I'm actually just buying a 4x multipler, so if the limit actually increases in future (say when the next girl is available) my multiplier will adjust itself?

Just don't really want to spend basically double diamonds for an extra 75%.