If u wanna express"为什么你有钱，我却没有"in English, the correct form is "why do you have money,but I don't?" The subject in this sentence is YOU,u can not use DOES.

Thank you for your clear answer.

Correct grammar would be: Why do you have money, but I don't (do not)? Use 'do' when the subject is I, you, we or they. Use 'does' when the subject is he, she or it. In this case, the subject is you in the first phrase and I in the second. Why does he have money, but I don't? In this example, does is used since the subject is he in the first phrase.