Part of the reason why Amy lambasted Zoidberg for being poor was because Amy herself was the daughter of a rich couple. He is an honorary member of the Harlem Globetrotters along with Hubert, Amy, and Hermes. In Bender's Big Score, Zoidberg reveals that Fry is the only member of Planet Express to never strike him.

Why does Hermes hate Zoidberg?

It is implied multiple times that Hermes hates Zoidberg simply because Zoidberg is a Decapodian as Hermes frequently calls Zoidberg a "Filthy Crab", which may be taken as a racial slur.

Who does Zoidberg end up with?

Marianne outside Planet Express, in 3013. Marianne is Zoidberg's girlfriend.