I don't interview if there isn't a high chance that I'd take the offer, but I pay attention to salary trends and opportunities pretty much constantly, because top-notch opportunities are uncommon and usually come through networking. Chance favors a prepared mind.

I wouldn't waste someone's time to "just humor" them. I feel like that would backfire.

Right, I guess my question is more how do you keep opportunities open without investing time in either interviewing or interfacing with recruiters.

I've also updated my bio with a email address per your other comment.