i had almost same thing not so long ago
my geared char was clanless
and i was trying to make a deal for a expensive item
i could get 1 gb cheaper if i joined his clan
i think to myself why not , ill quit after the trade
when i was ready to make the trade he sended clan invite -.-
than booom teleport to capequest, getting spam traded by 2 nub chars and ass kicked by babachar

my fault but ... things like this shouldent be possible