I had an expensive item for sale, I had to wait a few weeks to sell it but you need to have an idea of what you'd like to get for it: only pure, pure+ets, pure+items and especify it in your trade lot. Also be sure of how much you want to haggle on it: 100k? 1m? 5m? don't be discouraged of underoffers, it's plagged with re-sellers and that is what they will try to do! Just be patient.