If you’re leaving a job and giving an exit interview, only tell them it’s about money.

No matter why you're leaving, tell them the only reason is that the pay isn't enough. That should be the only reason ever recorded by HR for anyone quitting or moving to another job. Even if you're moving to another state for totally personal reasons. Even if your billionaire uncle died and left you a fortune. Tell them you're leaving because you weren't paid enough.