Top tier items will be tradable through the bazaar. Some things people do to crafting those items could cause them to become untradable. For example, a crafting glyph could be 100% success chance but binds the item to you so it’s no longer tradable. (This isn’t implemented yet but it’s a general example)
Selling crazy cheap items for ultra high value will give a percentage to the bazaar itself, thus helping with inflation and repeatedly doing this may be cause for warnings. I say may because we haven’t set out specific guidelines as to what behavior is OK and what is not. We would be more interested in restricting the RMT gold sellers than the players interacting with those systems.
Because we want to foster a competitive scene we would like to keep RMT as rare as possible.
As for the legendaries, not uniques, most legendaries will not be tradable and yea it sucks to pick up one that you don’t need or want. We do have a plan for them to still be very useful. I don’t want to give too much away about that system because it’s still very early and could change but we do have a great plan for that.