My little lair, in Outreach, went from 518 silver to 732 silver, which is okay. It's in a 4 plot "town" without an entry pad (or portal) near Bridgeview which may have those.
I don't understand the pricing myself as I'd think the more desireable lair plots would be near resources or larger communities. The resources to make rooms of that tier. Communities to divide the machines and storages. With all these cargo discs that allow portalling, the entry pad is a nice convenience and is part of the pricing (I guess).
However, there are certainly other factors, such as view. Certain areas of Istaria have had "love" like Mia's Edge and the "Dryad" trees near Istarias Union. One lair in particular has an awesome setting. Also proximity of varied resources (like some mixed areas near Dralk) and monsters.
It'd be interesting to compare this "revalued" set with auction pricing to see what the players deem is lair (or plot) value.