How do you increase or decrease the amount of Merchants favor you want to sell things for?

I can only manipulate gold it seems.

However when i go price check a 2 lp item i want to sell, I see the exact same item for 0 gold and 10500 favor.

But when i try to list my item for 0 gold, the default favor is 2600 and I casnt figure out how to change that.

thanks for any help

You dont nor do you get the favor for profit just gold. Favor is there just to increase your rep.

the favor is a fee and it’s not traded between players

Favour cost to list an item or buy an item is fixed and is a function of the item itself. It should be thought of as a fee for buying/selling. You cannot change it. And the fee for buying a specific item is much higher than the fee for listing it (about 4x higher). This is why you are seeing that difference.