Everyone has their price
Definition 1 of 1
Pro Tip 1/3Figurative Meaning
It's often used figuratively, not implying actual buying or selling, but influence or compromise. 
We thought she'd never join the campaign, but everyone has their price.
Pro Tip 2/3Negative Connotation
This phrase can imply that a person's principles are forsaken when enough is offered. 
He always preached loyalty, but when offered a higher salary, it seems everyone has their price.
Pro Tip 3/3Moral Judgement
Using this phrase might indicate a cynical view of people's motivations and ethics. 
She said she'd never advertise alcohol, but everyone has their price, right?