ok, so the second point i hadnt thought out clearly before i typed, but the first i just didnt explain fully.
They wold be regular ltd edition expensive items that you can only get in shops and cant trade or sell, but these items would be SO expensive that thw Gaians who value expense over style (ie: most of gaia) would fall for it and waste gold on ltd edtion s**t that they dont need just because its expensive and ltd.
this WILL work if done right
as a thought, it really would not be hard to query the gaia servers (if i had access to the backend user data) to find out who is a mule and set up a query to BAN accounts that do what you described in point 2. If it follows a logical process, it can be detected and insta-banned by code, should gaia desire to implement such practice. after all, muling gold is against TOS. so in actual fact, its a better gold sink than i first thought, but only IF they use it as a means to catch the professional mules and ban them