What used speakers raraely come up for sale

I honestly feel that if a speaker is really good, that you won't see it on the market that often as most will keep it.  That said, this is also audio where so many change their components like some change underwear, lol.  

If a speaker has been out for many many years, then you will obviously see it being sold as there are just sooo many of them and anything can eventually get long in the tooth due to newer tech adn materials etc...

I also see a ton of some companies speakers always available as they change their designation every couple of years.  Wilson comes to mind.  Takes nothing away from their speakers, but that they change models often.

Guys one of the biggest reasons you may not see some speakers for sale is because they really didn't sell many if any.  You'd be amazed at some speaker companies making us think they sell X number of a model when in fact they aren't selling many at all.  That happens to even some of the 'larger' name companies.  Often times a model just won't sell for many reasons.  I was talking with a manufacture of electronics about this today as I found it an interesting post.  

I don't follow that very much to be honest.  That either makes me non biased or clueless. ;).  I'll take the later, lol.