Honestly I don't see the harm with trade interrupts, I mean if someone's done it to you over three times in a row then yeah it just becomes annoying, but you can just set yourself to Busy status. You can't help some people amusing themselves.

It adds a bit more to the way we can interact at least. In DCUO (forgive me for the reference to this...ahem...'game') you have a Trinket that could turn you into a Gorilla and throw barrels at people, which would actually knock people around, send them flying or a way to push people who are AFK into another area. Just engage in general jappery.