The sad truth is Birthday probably had the biggest budget of the lot coming off of Dark Horse's coins. Like Samuel said, there was probably a lot of time and money invested in those personas, booking the parties, staging the car accident (hiring stunt drivers etc.) all the prosthetics. A mess.
Whereas Roar, Dark Horse and This Is How We Do are all cheap studio sets with a few costume changes and they're some of her best and most successful videos of the era.
