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Wait a moment, maybe I understand wrong (English is not my first language) but I understand that you said that the Great Filter is the reason why we don’t see them and point out 3 possible points.
I dispute your first point to be not really an explanation or an option since saying “never feasible for any civ, no matter how advanced” just seems to be a too harsh limit on what a civ could do, which looking at our past history seems an unreasonable limit.
My friend, that’s exactly my point. That is, they’ve had enough time to show up but they are nowhere to be seen.
Your point seems to be that since there is the Great Filter (btw, to be proven) then there is no one else out there.
You exclude way simpler possibillities like the option that a civ just a couple centuries ahead of use could already be colonizating the nearby stars, they just are 1000 LY away so we cannot yet see them (assuming we even know what to look for).
The houses price would fall if all these houses would be put on the market at (roughly) the same time. Keeping them empty rise the house price because there is less offer on the market. And they sell these properties, simply in a very diluted period, so when they really need some money, for whatever reason.
To be clear, keeping an empty house cost money to the owner (taxes, maintenance and some other expenses depending on the house) but this amount is still less of the money it would cost to rent it to the (way too often) wrong tenant. It is simply a lesser evil solution.
Well, if only the left wing would understand the message it would be better, but at least they are not in any position to make more damages.
Yeah. And I am afraid that there seems not to be an alternative