Keeping Up's ratings don't matter. E! just gave them 90M to keep doing the show and it's still the highest rated show on their network.
Britney will never get that kind of deal and Britney Jean (and every future flop album that she's forced to make [remember when she said she wanted to retire after Britney Jean? LOL]) is NOT the highest selling album on her label.
People with money enjoy exclusive things, all of them are going to move to tidal if they offer a quality service. Like a ferrari, a little amount of people can afford them, that doesn't mean they don't make money.
I'm sure somewhere in the contract it declares if the ratings are poor, they can pull at anytime and the KKK's will only attain a percentage of the 90 million..
KUWTK is amazing though. The episode where Kourtney and Scott purchase a potential Modigliani and daydream: "if this is real, we could have money to put our kids through college!" And then Scott starts planning the helicopter pad.