The purpose? Well if you must know, it's nice to have a post that tells the Gurus whether we're okay with their price/content ratio and the level of information we're getting.
While new animations aren't easy, devs do recycle and repurpose them where possible and there are a LOT to choose from. Cats and Dogs was so hard because every pet needed every animation to be brand new.
It's actively new coding that I look for in the actual value of a pack. For example, in Get To Work its value was in Active Careers and making your own shop. However the devs now know how to make active careers, so any new active careers created involve recycled code. Resturaunts and running your own vet clinic are based heavily on Get To Work code. I'm not sure how much of the Fame code will be recycled from Vampire perks.
