I if I bought a game (GTA SA) on my USA Gamertag on the USA Xbox Live Market Place, and then signed into my Australian account, could I still play it?
yes with normal arcade and dlc it would work
but because it is an xbox original and a baned game in australia i'd imagine there maybe region locks on it
any game with violence and certain content that may have a ratings issue with certain countries
like halo and call of duty tend to have region locks on them
you can try but if you get the region error there is nothing you can do to purcahse it
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You should be able to as I have purchased many arcade games and have been able to use them on other profiles.