I wanted to start storing my excess meso on mule characters since I've heard that there are issues with mesos being lost by the server if someone has max meso in their inventory. Obviously this is something I (we) want to avoid. What is the most efficient and fastest way to do this? I want to minimize the amount of tax withdrawn via trading and shop, so that most of my meso goes through to the accepting character. Thanks for any answers/guidance!
I'd make characters on the same account as your main and use the storage system. Store mesos using your main and log on your mule and take the mesos out of storage. It's tax free. As for transferring mesos between characters on different accounts, setting a shop with arrows at 49,999 meso each avoids taxes, but it's quite a hassle. I set shop with arrows at 999,999 meso each. This has a 0.05% tax rate, but it's only a 5m loss per 1b.