Why does Gatsby hire all the servants?

Gatsby hires the servants to impress Daisy. He fires the servants when Daisy starts spending a lot of time there.

Hiring new servants.....

My Finn informed me that Gatsby had dismissed every servant in his house a week ago and replaced them with half a dozen others, who never went into West Egg Village to be bribed by the tradesmen, but ordered moderate supplies over the telephone.