I'm new to survivor mode. I tried 1 deck with a couple of pussycats and bridget, and it turned out decent, with 8 wins.
I have charlie, and a few decent ones. Should I invest money on better cards of the clan (namely yaoi), or is it not worth it?
PCats + Bridget is definitely viable in Survivor. Works at higher survivor counts in a much different way from most decks. You'll need to pill smartly (obviously, but even more so with PCats) at higher survivor counts, but you should be able to break 10 and go higher.
Staples will definitely include Clover, Malicia, Yayoi, Lena, and Leela. Personally, I'd throw in Florida Jane, and Charlie as my last two.