I've never pulled a rainbow on Nutaku. The only rainbow girls I got (aside from the crappy one that everyone gets eventually) were from an apology exchange ticket and from FG step up gacha.
Well, at least there will be a ton of money saved on garbage disposal. Though, on the other hand, there's also the higher than average chance to get murdered in your sleep.
Done and done. It's really a big help, all these suggestions. There's already a ton to learn while trying to make up for lost ground and while I'm not above doing some research myself, it's not like I want to get a PhD in FKG.