Not sure has i have never done it but i think you buy a player like IF HAHN for 11k and then list him for 200k and then go over to mmoga and accidently buy 200k coins and put in the details for a single player auction.
Again, never done this so dont quote me on it.
Risky - EA are pretty hot on the coin transfers at teh moment. Fair few people over at Reddit are getting coins wiped simply for transfering coins from one account to another. Then again, if you spend them before they can do the wipe you should be good.
I'm still playing - should have this squad in a few days, with everybody rocking their TOTS versions.