I love housing, heck Id even admit to be a bit of an addict and usually buy any house that is up for sale but... The drop rate of Vile Coagulant deters me from buying the Bastion Sanguinaris to be honest.
Ive been farming the harrowstorms for about 8 hours strait and for my effort managed to get 9 Vile Coagulant. To start with Harrostorms are really a bit of a pain in the rear to even find, and considering you need two Vile Coagulant for one epic piece of furnishing that is just too much of a painstaking effort in my opinion.
I get you have the point that lore dictates that Harrowstorms are rare and special, fine by me and if you put your mind to it they are not that hard to find if you put your mind to it especially if you make a group for doing so. And I love the fact that unlike dolmens and geysers, they cant be soloed and this encourages people to cooperate to take them down.
However I have been farming these for days to get a stock to furnish a house in the vampiric theme and on average the drop rates are abysmal to say the least. Naturally people try to profit as much as possible on this and I am seeing lots for sale at insane prices.
Obviously you want to sell crowns, being a mainstay of your income from the game, but speaking for myself here, the fact that Vile Coagulant is so hard to find at decent price levels makes all the difference for me not to buy the latest released house.
Since you are about to make a major release DLC and patch kindly consider to at least make it a guarantied drop for daily quest reward (like shimmering sand in Elsweyr), having to pay 50K+ for a single furnishing item is just prohibitive and... no I will not buy it fully furnished ;-)