The sell value is a fraction of what the listed value is.
All traders give the same price when buying stuff (regardless of their opinion of you or any discounts on their sell prices). Adding an enchantment should make equipment with an empty slot slightly more valuable, but by the time you factor in the ingredient cost (or sell value), I'm not sure you would be much ahead that way. I never bothered doing that (I did buy stuff only for the enchantment it had, remove it to acquire the formula, and sell back the equipment at a loss, which was still cheaper or faster than buying the formula directly).
You'll probably get most of the excess gold from merchants before taking over the battle tower, anyway. If you have lots of whisperwood and fatfern, you can make level 1 or 2 Full Resistance or Dexterity potions to sell. After taking over the battle tower you can send your runners out to collect diamonds and malachite ore to sell, if you need to.
Runners and Tower ? /
Very low success rate with Fanny Blossom?Welcome to the forum.