I used to collect these, they are priced between 15 USD and 50 USD for the bigger exclusive deluxe pieces with art box and everything:
They look incredible detailed and have a very high quality, they are about 1/6 scale.
I assume Doomsday is made of the same material. Doomsday is 1/4 and an a bit taller character than the Tauron Shamane.
50 USD (retail price of the big chars from WOW) / 4 x 6 (scale conversion) = 75 USD x 1,5 (to compensate the size of the characters) = 112,50 USD
+ 1/2 of Doomsday is made of polystone
+ base that is missing on the WOWs
+ add some higher license fees for DC
+ higher fee for the designers
+ SSC service
+ the profit margin of Sideshow
-----------------------------------------------------
= 1235 USD
Chris