People can & will walk away for reasons other than competing offer. It also depends on how badly they want to get a new job. I both have and have seen others interview on the basis of "sure, why not" and if the pot isn't sweet enough then whatever.
That said, people in this position should cite how sweet that pot needs to be upfront instead of after the fact. But that doesn't always happen.
That said, people in this position should cite how sweet that pot needs to be upfront instead of after the fact. But that doesn't always happen.