I have a few things that I wonder what our gilselling situation would be like if they were implemented:
1.) If Gil could only be used on the Auction House or through the Bazaar function (i.e. not traded or delivery box).
This is all a player really needs to use gil for anyway. I believe this would make a rather hard obstacle for gilsellers to get money to their customers.
2.) If people could see who they were buying things from off of the AH.
If instead of seeing the "lowest available price", people were able to see who the person selling the item they are bidding for is. In other words, if you saw Linqifei selling O. Kotes versus Sophus selling them, you would naturally tend to buy from Sophus, even though Linqifei's price may be lower because you know he's a gilseller.
3.) If SE implemented a "zone life" patch. That is, you had to be out of a zone for so long before you could go back in. For instance, all zones have a limit of 24 hours that you can stay in that zone straight. As you leave the zone, your time rebuilds, capping at 24 hours.
What I mean is like:
Sophus goes into Castle Oztroja for 24 hours straight. Then, the game removes him from the zone and doesn't let him re-enter until he's been out for at least an hour. Then, he could only stay in the zone for one hour before it kicks him off. Say he leaves the zone for six hours. That means he could go back into the zone for six hours before the game removes him.
I probably didn't explain that above thing in a proper way.
This timer wouldn't affect people who are "logged out", in other words you rebuild time as you're logged out. This wouldn't be a problem for actual players, as you'd actually be sleeping. This would be a very big problem to gilsellers, as they never leave the places and would have to camp them on "shifts", like how Czardas camps the Thief's Knife.
Get what I mean?