Japan is starting to charge tourists more to visit
cbc.ca
cbc.ca
You cant charge more for flight or entrance fees because that will damage business travels or people simply visiting relatives etc.
Do this for just one year, amass a huge fund[0]. The next year, remove it, and see even more renewed interest to come.
[0]Likely would be gobbled up by the fund managers going to hostess bars.
You don't legally need to even be a resident to buy a property here, so there's that.
And yes, beautiful homes in beautiful places can be found for quite cheap here. But what social media doesn't tell you is that most of those places need a lot of work, are very far away from anything, and there is no "growth" of any kind in those areas. If you have the cash, no kids, work remotely and are willing to learn the language/culture... totally doable.