There are a at least a few expensive items that are soulbound on equip—one example, being the Infinite Gathering Tools. I can see the reason behind not making these items account-bound, but I think there should be a way to switch these items to new characters.
Introducing an “Unbind” Stone would solve this dilemma. The stone would revert all items to their previous unbound state, plus add a default “accountbound” property to prevent selling of used items.
It’s my guess that new themes of the infinite gathering tools will be released at some point in the future, so all the more reason people should be able to unbind the tools.