Oh I totally agree, I also believe this was a mishap on SE's part. A part of me wants to believe that they did this (the outrageous pricing on plot deeds, not even the houses themselves) to lure out all the RMT accounts and gil spammers. Coincidentally, I was logged in for a few hours and NOT ONCE did I get a /tell from anyone trying to sell me gil and how they'd throw in extra as a part of their Christmas special.
Please note that I'm not trying to excuse their business decisions regarding FC housing. Honestly, the hype they brought on with FC housing got a lot of people with the perception that they'll be able to get it. I at least assumed there would be effort needed in order to get it, but a 20 million gil effort is just too exorbitant for a casual player like myself. I don't have the extra hours to put it like a lot of people can.