I was thinking today that with the change in bitcoin and all of the scams and bitcoin fraud that is going on these days not just with bitcoin but with using bitcoin as an excuse to commit fraud ....
the only fraud which is related to confirmation that can happen is "double spending".
so in that case the 3 confirmation is enough, but you can always wait for more if you are transferring larger amounts of bitcoin to be sure.
p.s. if you had any other form of scam or fraud which is related with confirmation, do share with us.