If the PS Audio Stellar 700M is as great as all the reviewers say....

This I can tell you these new ps audio monos do sound very respectable 
adding a12au7 tube per mono block ,but what’s missing  is the realism  depth and liquid realism , for example I heard them vs the pass labs 60 class a integrated , ,the pass labs doesnot have the power or the slam ,but is far more natural sounding much more on the warm side triode like ,The other the latest Coda CSib integrated amplifier with the 250-500 wpc  12 first watts in pure class A , which is very tubelike in many ways more pentode then the warmer triode usung jfet,Mosfets, and bipolar  transistors on the outputs. 
but the leading edge is more defined having a separate class A preamp section 
Was very surprising and the best balanced of the 3 ,from  what I heard or to my taste. Based on that I ordered the Coda ,and just came in after a 6 week wait.,I  wanted the lower power  one which has class A first watts  of 18 then              150-300wpc . 

@n1dr folks are upgrading to the newer and more powerful M1200s. 

I’ve had a Stellar 300.  Very transparent, great tight bass. Needed 100hrs burn in, sounded bad right out of box. For me it was a little edgy with my Cornwalls, but Klipsch can get edgy quickly without a very smooth amp. 700 is supposed to be a little “warmer”.  As far as there being a lot of anything on used market, I think you have to factor in scale of new sales. A large scale maker, like PS Audio sells a lot so they is likely to be more for sale used.  Also, upgrading is a real addiction in this hobby, not really an indication of poor performance, we just alway want something a little better! 

M700 is their least expensive mono blocks and they do sound good, but their bigger brothers like M1200 and BHK 300 are in a different league. People likes PS Audio products often do upgrades and they have generous upgrade program. Therefore many trade-in such as M700 ended up in the used market.

Because PS Audio markets much better and deeper than just about anyone. So people are attracted. More sold, more resold. TMR is their designated dumper for the trade-up people. 

If you do enough homework I think you will answer your own question.

Good luck!