Because a "survival score run" is what I do every run. :| And I don't think I've ever gotten more than 150 million, if that. 'sides, the reason I use Marisa A now (back when I first 1cc'd EoSD lunatic I still used Marisa B) is because frankly Marisa B is an inferior choice to Marisa A in every possible way. You have to shotgun to do damage that isn't even as much as Marisa A does, your damage output is dependent on your laser, and Master Spark isn't as useful when you get good enough to end every spell card on one bomb anyway (except Scarlet Meister lol)