For all those who wonder about the button: Buttons output a redstone signal for 1 second. The idea is to make a sign output one second as well. The button is just a comparison.
+1 I sort of get it. And if I understand it correctly I have a few uses for this as well so I like this.
How about like certain people can use this for example people with extcreations can use this. It can be added to a donation feature and people can buy the feature to use this. I'm sure andrewkm would like this idea
But if it's using trade signs, you can't limit the type of trade the user wants to make. Maybe I'm wrong, I know nothing about this
I could place an empty dispenser. I could place a normal sign next to it that says that reads "Selling Chainmail - pm me". Then I could have a sign next to the empty dispenser and charge like $1000 per click. Profit OK, I guess I could give in and place arrows in the dispenser. Oh so many ideas this brings...