I find that, when I am considering which items to deconstruct for essences in Cannith crafting, I look for those items with only a prefix or suiffix. Items with both tend to be worth more coin (due to higher level), and sometimes it is more worth it to sell them and buy essences instead of decon them.
I know (I think), currently, the amount of essences you get depends on the "plus" for the prefix/suffix effect, not the full plus level of the item.
An idea:
What about bumping the decon essence level up a bit based on not only the prefix/suffix value, but the full item value as well? (As if the item had mor emagical power to convert into essences.) This would encourage more decon and less sales.
Another idea:
Of course - I'd love to be able to decon and get both prefix and suffix essences (using both prefix and suffix decon ingredients).
This is coming from a casual player who is struggling through the low-mid 40s crafting levels . . . (ssssllllooooowwwww)