The akiya house has minimal value if/when we switch to another location. It's an asset, but not a useful asset. Or at least, none of the ideas tossed out so far are likely to be anything we actually want or need. Maybe we can sell it later on and get some of our money back, but it's as much sunk cost as the getaway for most purposes.
The getaway is sunk cost to at least the same extent as the akiya house by the time we're done with Tokyo and are looking at recruiting people. As such it has no monetary advantage. It costs us less in the first couple months, but the primary value for that was to have enough cash on hand to start the courier expansion, and it's very unlikely we can start that before month 4 anyway. So its advantage in the short term is moot.
Its other advantage is to wow Serena when she shows up, but that comes at a long-term cost that hurts us in a lot of ways. It's not in any way an asset.
The village is an actual true asset. We can do things there that we can't do elsewhere, and it has the potential to become another income source. However to reach that point will require a lot of investment and research, so we won't be recovering that money anytime soon. It's also not something we can get up and running before Serena arrives, which takes it off the table entirely for our short-term needs.
The getaway has the lowest short term costs (up to 3 months out). The akiya has the lowest medium term costs (3 to 12 months out), but carries a small contact risk. The medium term is where we really need to be looking for costs, because that's where we're spending a ton of money: new recruits, courier expansion, Kyouko's church, etc. However we also need to get rid of that contact risk, which means ultimately we must move to the village for our long term setup.
Of course, the investment into the village is such that repairing 5 houses is equivalent to staying in the getaway for 2 years. And there are about a dozen houses. Plus the possibility of wanting to build other stuff. Full village repair, without upgrades, would be $600,000, or 5 years in the getaway. On the other hand, that's actual investment, not sunk cost.
As an aside, if there's a 5% chance of contact risk per month at the akiya, that's a 45% chance of contact per year. At 10% chance per month, that's 70% per year. And there are options to mitigate that, even if we can't buy the other akiya homes.