Dictionary / Vocabulary / 贅沢な悩み
ぜいたくななやみ
first world problem; good problem to have
貯金ばっかり増えて使い道がないだって？そりゃまた随分贅沢な悩みだな。
You say that your savings are piling up and you have no way of spending them? That's really an extravagant kind of worry to have.