While I still think the prices are ludicrous I can see the reasoning behind it. They needed to be expensive (but not this expensive) to start off with as it's a better option than making them too cheap. As unbelievable as it may be, there probably are free companies on legacy servers with that amount of gil. For instance our FC only has 10-12 people and we have more than enough for a medium plot on Ragnarok (Although we're not buying one at those prices).

We can only wait and see if these plots actually get purchased. If a couple of weeks go by and nobody buys anything then SE will know they made the prices too high and probably adjust them accordingly.