Anyone ever do a DVD purge from their collection?

Selling DVD's is a waste of time. All the listing and fees and mailing for a dollar or two profit.

Their is a place near me called Grindhouse Video and this guy take store credit for DVD's, I am thinking about purging a shitload of my "watched it once" horror movies for some box set.

Anyone else ever wonder what do with our "watched once" dvd's?