Undercutting

[Equitable_Remedy]

undercutting by 1 gil is fine

tanking the market because you think itll sell ‘faster’ isn’t.

I don't know where to begin with this.

Buyers want to buy at the lowest available price. If someone is willing to sell an item at a price lower than the price at which you are will to sell that same item, that someone does not have any obligation whatsoever to raise their price closer to yours. Either you lower your price, or you wait until the market clears all the sellers willing to sell for less than you.

Because, unlike the real world, your character doesn't need things like food, shelter, or clothing and doesn't want things like entertainment, sale prices are largely valuations of time (to farm a thing, craft a thing, roll for rare things, etc.). Different people value time and gil differently, which is why the clearing price for an item (say lvl 90 group maps) can vary significantly over time as different people with different values post.

That's called a market.