have a vested interest

have a vested interest (in something)

To be very interested in something, typically because one would potentially benefit from it. Of course I have a vested interest in how the board reacts to this proposal—if they like it, they might promote me!
See also: have, interest, vested

have a vested ˈinterest (in something)

have a personal reason for wanting something to happen, especially because you get some advantage from it: He has a vested interest in Mona leaving the firm (= perhaps because he may get her job).
See also: have, interest, vested
References in periodicals archive ?
If the A's aren't moving south, then he intends on holding the club in a sort of hostage while those that seem to have a vested interest in making a new ballpark in Oakland occur.