This is a point. Subsidizing your commute and dealing with the pain of regional reserve juniority is a part of dues paying which people put up with as a means to an end.

But I still recall more than a few J4J takers the last couple times. Maybe for the benefits, maybe just because that's what they know how to do. Also if they think they're going to be out for a loooong time, they may want stay current and even build time to open up other avenues in aviation.