I think this is the norm, written or unwritten. My first boss hinted that someone else did the same thing and they matched the offer. And every other boss has been quick to counter offer as soon as I hand in a resignation, but by that time I've already mentally clocked out. Keep in mind that the interview process can be grueling. It takes tremendous energy to change jobs, and anyone who went through the trouble is probably already lost.

An alternative solution might be doing what my current job does - if anyone has a goal that they need more money for, they should bring it up with their manager. You're probably not going to get a raise if you're comfortable, but some people have to deal with debt, housing costs, medical/family expenses, weddings, and these people feel like there's no other choice but to job hunt.

However, I think the honesty is reassuring.