Why are so many EVo's for sale?

I own one and like it but don't understand why there are so many for sale.
Could it be because there is a new model out?
there have been many revisions to the original evo 200.2 along with the introduction of the 200.4 which can be run in dual mono and offers a bigger power supply than two individual evo 200.2s. i own one as well and i love it but if i get a chance and a good enough deal, i'll sell mine and get the 200.4 and run it in dual mono.