Your real competition isn't some job hunter off the street. It's the candidate who was coached by The Headhunter. From The Archive 46. More vacation is good for the gander.
Employers love to base a job offer on a person's last salary.
That's why they ask for your salary history. If you divulge your old salary, you're screwed because you're left with no real room to negotiate. Because earned vacation time reflects your value, just like salary does. What's good for the goose is good for the gander. And more vacation time is good for the gander.