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.
morasp10b3
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.