I think you should be able to have an offer on indefinitely, but only have a certain amount of offers much like the GE. The difference, from what I'm seeing, is that this would be more like a pinboard than a trading system, which is really cool. I agree that they should only be shown while online, and possibly only in the same world as you, that way trading converges into certain worlds the same way it does now.
As for actually alerting the seller that someone is interested in their product, I think it would be intuitive to have a button that, when clicked, lets the buyer send a pm to the seller. It would just be a normal pm, same as chatting someone on your friend's list, but without having to add them.
27-May-2014 01:45:08