The Dark Clergy, while sounding formidable, was so scorned by Goddess Shael that she chose the Corrupt Divine Position instead.
It indicates just how weak this deity position is, amounting to mere scraps picked from a grand theme and then self-proclaimed as "darkness."
In actuality, it could simply be an inconspicuous speck of paint on a canvas.
Such a deity position, when merged with a mortal, indeed grants instant divinity, even if the divine power is minimal; this is a qualitative change.
However, trying to sell it to a deity is a bit embarrassing.
It's not just a matter of weakness; the origins of this position are somewhat problematic, and merging with it could cause trouble.
The deities who aren't afraid of trouble are powerful and look down on such a weak deity position, while weaker deities might want it but can't afford the trouble it brings.
Therefore, selling this thing for a good price becomes quite difficult.