The phrase "vested interest" means that someone has a personal stake or financial involvement in a particular thing or situation. They stand to benefit or have a lot to lose from the outcome. Full definition
People who have an interest in seeing data in a particular direction have a hard time being objective about a range of judgments and in a variety of contexts. (christianitytoday.com)
If you're supporting him now, you don't have the interests of the club in your heart. (justarsenal.com)
I like option number 4 as refinancing is still a great idea for those folks who still have interest rates in the 6 + range. (thecollegeinvestor.com)