I get paid for it, and also get to work more closely with potential future teammates to better test the relationship. Having had interviews at companies where

I get paid for it, and also get to work more closely with potential future teammates to better test the relationship. Having had interviews at companies where it was NOT as advertised during the interview phase, I'd value that. If I was already interviewing for another job outside of my existing one, I'd gladly take a week off to do it. But if they were trying to get me to leave a job I already liked, I wouldn't commit that much time for it.