"I guess that the people accusing others of being parasites are the ones that depend on ad revenue for employment. "
That wouldn't surprise me.
I've spent thousands on "targetted advertising" (print and online media) and I can assure everyone that a small cheap untargetted static advert in the right location will usually get better results than something large, flashy and "editorialised".
The saying that "half of my advertising is useless" is wrong. It's more like 90%