It was a pretty big stab in the back when they clearly showed capability of letting us have more retainers, except they dangle it behind a pay wall.

From the 3.0 patch notes:
"[2.0] Players can now hire up to eight retainers.
* Players are normally limited to two retainers per character. To hire additional retainers, please use the optional retainer service (http://sqex.to/4Aq) available on the FINAL FANTASY XIV: Mog Station."