What are people actually buying on Ebay?

I have been selling on Ebay for ten years now, and I have noticed that sales have gone WAY down recently. I think maybe I'm just not selling the right thing. What are people buying? and please don't tell me - "people buy anything on Ebay" or some thoughtless answer like that - People don't buy just anything - I have tons of un-sold stuff. what are people actually buying nowadays?