laugh all the way to the bank
Also, cried all the way to the bank. Exult in a financial gain from something that had either been derided or thought worthless. For example, You may not think much of this comedian, but he's laughing all the way to the bank. Despite the seeming difference between laugh and cry, the two terms are virtually synonymous, the one with cry being used ironically and laugh straightforwardly. [c. 1960]