There's lots of talk about supply and demand, and demand at certain prices... blah, blah, blah.

FFXIV MB is not RL. For many items, there are 0 to 4 or 7, or maybe 10 or 15 buyers per day on average. Most every one of these buyers would buy at a huge range. They aren't price sensitive. They don't care about history. They don't wait for a deal. I can show you people who bought VENDOR items at 50-100+ % above vendor price on the MB. Any night for the last two weeks I could grab an SS of that. So the market is more about being the low priced item right when that next buyer comes along, period. Coming in and selling at 30% lower isn't getting a sale any faster, since everyone was really just waiting for that next buyer to show up. (Yes, there are items where there is some price sensitivity, usually because it is high-gil item, or maybe it is a high-volume craft item. But still, it's not like there are hundreds of buyers who will suddenly buy if the price comes in 10% lower, like in RL)