Transferring Geos. It may have been said or is in effect(don't do so don't know myself). If transferring to another person, charge a percentage of the transaction from that person, user fee of sorts. You could even have a 24hr holding limit till it processess. Like real life transfers. That would discourage geo transfering a little, if percent/time was a high/long enough an amount. "GST(Geo service tax)." The more inconvenient the process the less likely players may do it? You'll still get the multiple accounts occuring, but they can't immediately use the funds if needed to buy armies.
Just a thought? good, bad, redundant?