Don't think so, as you can only have 1 stack of max cash can't you. That's why people use the ge and items to store money.
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From what i remember you can have your 6 slots in GE, 1 in invent + 1 in bank
Some people use shards as money, I think you can have like 56bill worth in shards on a 2.14bill gp limit, well that's what they done before free trade anyway.