We discussed this about 2 months ago and Thomy thought a staking tax of 0.1% (iirc) would suffice. I disagreed and suggested ~5% instead. But as you can see it's not in the game so the idea died out. At this point I don't even think it's a good thing to add anymore. Implementing a tax system only works when people are only staking coins so it would have to be made impossible to stake anything other than coins. Now this means people will dump all of their items in the ge, items that are already not in high demand resulting in a massive item crash.
I agree. So what do you guys think of the idea that, Coins are 'taxed' accordingly as described above. Secondly, Ex1 Items can be 'taxed' too for example to be able to stake 5 fire capes you need to pay 1 to 'tax'. Ex2 100 mithril arrows 10 arrows go to 'tax.' Also, i'll come up with a more descriptive way tomorrow.
If anyone wants to add more ideas to this feel free!
Edit before I go to bed: The only Problem I see with my current suggestion is there will have to be a rate associated with each item id. Unless there is a way that you can associate multiple id(s) rather easily.
Example: all arrow(s) and bolt(s) id's are considered to be 'projectiles.' Then you tax all projectiles, the same taxation rate.