Reason why I wouldn't throw subs or money at Sinder or Stronny Cuttles is that they have a fuckload of past lewd audios archived that you can always go back to.
I think there are a some reasons why new stuff could be worth it over getting the old. First off, she had started off with the NSFW stuff, so while they are good, she has improved her VA/RP skills a LOT since the first stuff she has released.