Not as often as you think, probably--they buy really GOOD furniture and take good care of it--usually--and that makes it last longer. Also, quite a few of them buy classic styles that don't have to be changed just for fashion.It's one of the reasons rich people STAY rich--they don't keep buying large items like furniture and then changing them frequently. They buy high-end furniture and keep it for longer--like with the other things they buy--when you buy the best, you don't get rid of it on a whim.
Only a rich person can answer that question and unfortunately there are none of them here on Yahoo Answers which is a free answers board. Rich people have better things to do than to waste their time answering questions here.
they tend to keep old furniture for the rustic look
Virtually never as they buy antiques...and a new kitchen every couple of years.
they sell junk make millions then buy the best
as often as they want to
(ask a stupid question - you get a stupid answer)