I've probably unpublished or outright deleted more than twenty hubs in the past month or two.
Most of those I simply moved to one of my blogs on blogger because they really shouldn't have ever been hub pages to begin with, but rather, blogs.
In other words - if something isn't performing well here, then my subdomain will benefit from me getting rid of it. I seldom just delete something from the entire web - but I've done that too. I generally like stuff I created enough to just move it to another place...where it still might get an advert click or something some day.
I've also got several hubs unpublished due to me learning new things which allow me to see ....tons of bad information on those hubs that needs to be corrected....