The strangest thing is, as a scroll boosted player with 8 moonstone sets, I don't have a surplus of scrolls. I use my scrolls to purchase silk and crystal and rarely go more than a few hours before they are taken, usually by my neighbors. All I have to do is discount them enough. So who has scrolls they can't get rid of by discounting them to 25% or so? Of course, my neighbors are treating me so "unfair" since they keep taking my "unfair" (to me) trades.
In the end I suspect paying attention and letting somebody else (the devs) tell you what your scrolls are worth may be more the problem than anything. If you hover over the star ratings you get, for 3 star, "This offer is a bargain. The wanted goods are far less valuable than the offered goods." Hovering over a 2 star rating says "This trade is fair." Sad, as obviously it just not true for scrolls, or "fair" doesn't mean anything. If scrolls were as valuable as silk and crystal there wouldn't be a problem with trading them at the "fair" game determined value.
So again, human psychology trumps planned economies and reality proves the idea: "if we all just believe it, it will work" to be true, but only in a closed society where no one is allowed to trade other than at the prescribed ratios.
AJ