I thought of a loan system but that would never be possible @_@
The only way I could think about getting meso back to the bank would be implementing a secondary tax that would take away meso from monster drops, trades and it would pay off your debt. But sadly it would be way too easy to just scam the system @_@
edit: Unless you do some type of collateral, like 5k nx to take out a loan or something. You buy a 5k NX ticket for a 50mil loan, give the NPC the ticket, you get your 50mil and once the 50mil is completely paid off you get your 5k NX back. But this would be pretty much the same as buying mesos. Sigh.
The only way I could think about getting meso back to the bank would be implementing a secondary tax that would take away meso from monster drops, trades and it would pay off your debt. But sadly it would be way too easy to just scam the system @_@
edit: Unless you do some type of collateral, like 5k nx to take out a loan or something. You buy a 5k NX ticket for a 50mil loan, give the NPC the ticket, you get your 50mil and once the 50mil is completely paid off you get your 5k NX back. But this would be pretty much the same as buying mesos. Sigh.