How do you sell in the MTS?

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I don't even try to sell clean dropped equips unless they've above average stats, besides DEF of course (e.g., 1 more INT than normal for that level shoe). Much better to disassemble them and sell the monster crystals in FM. (Aside: I really wish they'd update MTS to accept Monster Crystals, Magic Powders, and upgraded gems. How long have we had Maker already? Seems absurd these items are still non-MTSable).

Scrolls I try to sell by the bundle, 2-10 at a time, unless I only have one of that kind. Less tax overhead that way, cheaper for the buyers and more nx for me. I always search for the item before I price it, I don't use such rules as you listed because I find prices change too much.

I also sell ores, always in stacks of 100, again after searching for current price.

Unfortunately, since the hike in MTS tax, selling quest items for 110nx doesn't work nearly as well as it used to.