Nope you didn't add enough plots SE...

[Jojoya]

I don't care about making money with it, I just enjoy the concept.

Have you asked your free company if you could garden at the FC house? Many FCs give members access on request if the garden plots aren't currently in use for FC purposes.

The concept might be interesting but few players end up enjoying it in practice. It's why you'll find relatively few houses with gardens in use, and most of the time that use is to grow shards for crafting or Krakka Roots. Those can be grown in flower pots, you don't need a house to do it. It's very rare to find a plot set up for crossbreeding.

They did add in enough plots, go an inspect how many houses is unused... not even decorated or anything, and people who only got the house for status symbol.

EDIT:
Move to lesser populated server, bigger chance to get a house, if it is that important to you.

How the owner chooses to use the house doesn't matter. If someone bought a house and there is another player still looking to get one, then there were not enough houses added.

While owning a medium or large house might be seen as a status symbol, I doubt anyone owning a small feels the same way. Most of those unused houses are probably either bought by players who didn't have anything better to do with their gil than buy a house or they're owned by house flippers waiting for a buyer willing to meet their price.

Also, there's no bigger chance to get a house on low pop NA servers than the high pop because all the wards are full on every world. I'm on one of the lower pop worlds. Within an hour of the servers coming up Tuesday, everything was either sold or on a timer because someone relocated. The houses on timers were all gone by Wednesday night.

Being able to get a house in a game shouldn't be dependent on one's ability to ignore sleep, take a day off work, sit at a placard for hours waiting for a hidden timer to end. Players in other MMOs with housing aren't expected to do this. Why should FFXIV players have to?