Idea 3: An Instant Sell Button
Ever had a bunch of items you just want to get rid of for the best price you can, but you don't care what the price is? That would be what this button is for.
Instead of setting a manual price, you would instead click this button, and have your item matched against the highest available active buy offer.
This matching would exclude buy offers that are currently paused due to hitting the buy limit, just like normal offers do, so the price you get might not the the absolute highest offer available, but it would be the highest offer usable at that time.
There are two approaches to this:
Idea 3 Approach A: Just Sell It
Upon clicking the button your item would almost immediately be sold. You wouldn't receive any feedback on the price that you might get until it was sold.
There would be a confirmation dialog warning you about the danger of this, but you could toggle it off.
This method would result in the minimum amount of clicks required, but with the caveat that your valuable item could sell for 1gp if you were very unlucky.
Idea 3 Approach B: Intermediate Confirmation
Upon clicking the button, you would get a dialog that would tell you the price the game expects you would be able to instant sell for at that moment.
It is possible that between this dialog displaying and you clicking the confirmation button, that offer may have either already been fulfilled or have hit its buy limit.
As such, once you confirm you are happy with that price, there would be a ~10% leeway for which it could find a similar offer, and if it failed to find such an offer, the sell offer would fail and act like a normal offer does when it is cancelled.
Non Goals
Given I am making changes to the grand exchange, I know there are some other areas of it that players would love to see changes around. Unfortunately, I have had to mark some of these as non-goals: