Eh I really didn't mind spending those 36k, I still have more than 62K remaining.>Is it seriously gonna take seven months to max out those characters?
I think the main reason they are limiting the memories to one a month is because, as I'm pretty sure you can see, they added the option to craft 2 generic SS memories alongside the K/Kula banner.
So, if we make some assumptions, we can expect that they would (probably) add the same option for future BS banners, and, if we could get one memory each week, like we can with C. Zero, then we would be able to craft the two generic BS memories no problem, and that would mean we would only need to get the character two times and then use the other two generic to get it to 3*, and that's bad for business, since less people will buy packages.
Also, what stones should I give to SS kula? I already have the three from the event.