Always get a prenub.

@Korora  
Odds are the answer was Diamond Tiara.

I like to believe she’s a demon in the sack

@Wayneponeth  
I like those thoughts. They make sense to me. =)

@Blazewing  
By how they interact with each other, Filthy Rich doesn’t really seem to care about Spoiled’s attitude. She showers him with compliments and that seems enough to win him over. And how Spoiled Rich treats Diamond Tiara could always be a secret to her husband. She could always pretend to be a sweet mother in front of Filthy Rich so he doesn’t suspect anything.  
That or Filthy Rich is too scared to leave his wife. With how he acts toward Granny Smith’s threat in the same episode, he obviously isn’t a dominant husband and he’s afraid of his wife’s wrath if he ever disobeys her, especially after he had Diamond Tiara. He has a bigger fear of his wife taking his daughter away from him. I like the idea that Filthy Rich knows Diamond Tiara is being misguided by Spoiled and he secretly tries to steer his daughter to the right directions. He could be why Diamond Tiara actually feels remorse and is a key to her redemption. But these are just my thoughts.

@DoctorWTF  
Hard to say, cuz when they were only engaged, she was still not afraid to be openly rude to her fiance’s business partners.

I ain’t saying she a gold digger.

@Blazewing  
Or she puts on a non-snobby front to maintain her relationship with Filthy Rich.

Presumably he likes crash test dummy coloured plot.

@Korora  
That’s something we’d all like to know. We know Rich loves money, but he’s also a decent and friendly guy. There has to be something Spoiled has to her that she, for some reason, refuses to let others see. It’s like she intentionally puts on a snobby front to hide her true self, like she’s expected to be seen a certain way. I dunno.

What the yaay does he see in her!?

Sounds like Grandma at least has the sense to know money isn’t everything.