Retainers are NPCs that hold your extra goods, similar to a mule or bank. They also buy or sell goods for you and hold the money from your sales. You start with 2 but eventually there should be the option to purchase more at a cost of $1/mo. Since the game is F2P, they are not currently available.
Mikhalia: and FWIW, my posts are 95% helpful, informative, or funny.
Mikhalia: only 5% or less of my posts are utter crap.
Tyapex: 393 posts of utter crap...
Mikhalia: Sounds about right.