How many people here generally buy used?

I buy Used, Demos, Blemished, B stock whenever I can. It's like cars.  I always buy last years models in December or January when they are desperate to get rid of them. When the Supremo Master Super model comes out, buy last year's Supremo Master at half price. It's just as good as it ever was.

Nearly always; let the other guy eat the depreciation. Same with vehicles. Only buy new when it’s not an expensive item; or if I just can’t find it used. 

All amps, subs, EXOs, TT, blu-ray player - used
speakers - factory refurbs but looked perfect
TV, pre/pro, CD changer - new

Most of my gear I bought used or demo. My system at retail price would be out of my budget . . . and retail price system within my budget wouldn't put a smile on my face.

Buying Demo units is a brilliant way to buy equipment for a better price. These are usually a safe buy. It usually means that a replacement is on the way from the manufacturer if you care about having the most up to date stuff. I have never bought used equipment otherwise but I have spun off numerous items in the past so a healthy used market is important for the audiophile who is continuously upgrading. 
I never bought used primarily because in my poor younger days I worked in the industry  so I usually got my stuff at salesman's comp ( frequently less than dealer cost.)