Concerns of Economy

A) The price for land (and house) deeds ingame is artificially low, so we can have a relatively quick'n'cheap way to test all the various lot sizes. I wouldn't surprise me if in some future R's, all the deeds are priced at 100g, so that everyone can test out housing. But this - as said by most answers - is in no way indicative of the prices at release.

B) Note that the add-on store has limits for the land lot deeds! I suspect the values are outdated, but if you click on every lot size, you have:

Row: 960/1000 available
Village: 150/450
Town: 88/100
City: 41/50

This clearly shows an intent to limit the availability of NPC-provided housing space, and raising value of individual lots by scarcity of such a resource.

C) My understading is that tax-free lots are reserved to high pledge tiers, to give unique value (and thus appeal) to them. I'd be a bit disappointed if my Ancestor level pledge ($275, with a rent-free row lot) would have the same option as a $85 row lot add-on store item.