I was seriously considering buying a seat for my evil twin on the same 4 flights as me for the AA MR with the 50k bonus, but the main problem would be at the gate reader while trying to have the agent board 1 person on 2 boarding passes. There is just too good of a chance that they would catch on and flag me instead of letting me buy 2 seats on the same flight. This is always a tempting idea, but short of making another AA account for my evil twin and taking the flights there is no good way that I can think of avoiding it.