This is the 7475th most frequent Japanese word.
儲
Profit; gain; earn.
儲けた is used here to mean 'to earn profit' or 'to gain' in the context of a business transaction.
彼は商売で大きな利益を儲けた。
He made a large profit from the business.
儲け話 combines '儲け' (gain or profit) with '話' (story), meaning an opportunity or story related to making money.
久しぶりに儲け話を聞いた。
I heard about a money-making opportunity after a long time.
儲かっている is used here to indicate ongoing earning of profit or benefit, particularly in financial contexts.